- The question - Rick, I've read your posts (as
well as those from High-Output Backcountry, Trax310,
etc.) for a while now. It has been a real learning
experience! I ride a Banshee. I ride mostly at Glamis and
I like to go fast! I like duning, however the first time
I won a race up Olds I was hooked on racing the hills! I
knew (know) very little about motors and hi-performance,
I do know that I wanted to go faster. I took my Banshee
to a local shop where I lived and asked the guy to make
my quad faster. He ordered the Stage IV kit from Trinity,
sent the crank to get trued and welded, and did some
porting. To make a long story shorter, the results were
not good. The machine was extremely peaky. When the power
came on, I could not keep the front end on the ground,
but it just wouldn't run the way I had hoped. It was
pretty frustrating. (Not to mention expensive!)
-
- I finally brought my Banshee to Trinity last February
and Harry had redid the porting and set it up the way it
is now. I guess he had to make some "corrections" on the
other guy's attempt at porting. Now my Banshee is really
fast! I recently added a 6 inch extended Lonestar
swingarm ('cause I still had a problem keeping the front
end down) and Ohlins, front and rear. I win 95% my races
against gas Banshees (and with all due respect) 99% of my
races with TRX's. (I am sure yours is faster!)
-
- A few of the guy's I've met and ride with at Glamis
have built their Banshees and they were always talking
about their modifications. Degree wheels, squish
clearance, high compression (200 PSI). I really didn't
quite understand what they were talking about! (Reading
the posts here, I am beginning to!)They've bored and
stroked their Banshees, and while their quads are fast, I
always win the races. My Banshee is a '97 with Trinity
Stage IV manifold (35 PWK carb ), Stage IV porting (I
don't know what the measurements are, and if Harry had
told me I would not have known what he was talking
about), timing advanced 4 degrees, Cool Head with 17 cc
domes, Toomey T5 pipes.
-
- On the Dyno at Trinity it put out 74 horsepower at
the top ( I don't remember at what rpm, when I go back to
Trinity, I'll get another print-out.) Harry overlaid some
other dyno runs on mine and tried to explain to me what
was happening. I do remember that while some of the big
bore (370, 410 and 440, I think) strokers did not have
much higher horsepower at the top, they had up to 15
horsepower more than my Banshee at different levels on
the dyno run.
-
- Anyway, my point was I didn't understand why my
Banshee, 350 cc with 170 PSI compression was faster than
their 200 PSI, bigger bore, stroked machines. After
reading about everything you guys are writing, it is
obvious that there is some very technical stuff going on
when it comes to properly modifying motors. If it isn't
done right, it doesn't work right. I still don't
understand port timing, squish width, degrees and angles,
but I know more than I did before! I really appreciate
you guys sharing your knowledge.
-
- I have a couple of questions, specifically about tire
pressure. I know there was a thread here that mentioned
the effect of tire pressure. Before my last trip to
Glamis (Thanksgiving), I put on new tires on my Banshee.
They were competition buffed (very light!), tall and
narrow haulers. Since I've put those new tires on there
has been quite a flat spot off the bottom. I can get good
launches, but I have to really feather the clutch to
avoid bogging. I am running stock gearing. My question
has to do with this. Should I change to a different
counter sprocket or should I try different tire pressure?
Both? Also, in regard to tire pressure, it was my
impression that lowering tire pressure would INCREASE
traction. However, someone told me that on some paddle
tires, particularly lightweight tires, that lowering tire
pressure would DECREASE traction due to the angle of the
paddles as they spun around. Apparently, increasing the
air pressure would make the paddles stiffer, therefore
changing the angle that they bit into the sand and giving
more traction. When I bought these tires I was told to
run them at about 6-7 PSI. (I used to run about 3 PSI on
my old tires). What would you suggest?
-
- I go to Glamis quite often. All of the holidays and
usually about 2 off-weekends per month. I race the hills
a lot. I have probably raced you some time. You were
probably one of the very few "R's" that beat me! I am
going to Glamis for New Years, are you going out? If so,
it would be cool to hook up at the hills! Thanks for all
of the interesting and informative reading!
|
- The response - There are a couple of things I
always say I'll try to do next year. One of them is to
make it to Glamis for more than a few weeks a year. The
other is to convert my TRX into a single purpose machine
- make it a hill shooter. Maybe in 1999.
-
- Even stock Banshee's with paddle tires will make
their front ends VERY light. Add to that some porting -
pipes etc. and you may have a light-switch of a beast
which would be difficult to ride. It's interesting to me
that Harry would use Toomy T-5 pipes on one of Trinity's
motors. If Harry got inside it he might have been able to
"save" what the other guy did - or perhaps actually cut
in some performance as opposed to running a grinder
across the surfaces of the ports and make it look as
though it were highly modified. Seventy-four HP peak is a
VERY good number on your quad. You should be proud of it.
You should be very competitive with that much HP
especially if you can ride the thing too - and it sounds
like you can.
-
- When my TRX motor started making some good HP I
started to have trouble with paddle tires. I knew there
was something wrong but I couldn't put my finger on it. I
attached a piece of masking tape across the junction of
the bead of the tire and the wheel. After a hard launch
the tape was broken. I was spinning the wheels inside the
tires. Switching from 8" diameter wheels to 10" solved
the problem because it increased the amount of tire/wheel
contact. I always index the tires. That is - be sure that
a paddle from one tire is exactly lined up with a paddle
on the other. This makes them both grab at the same
moment. Marking the inner beads/wheels with white grease
pencil will give indication of a wheel spinning inside a
wheel. With the same amount of air in both tires -
measure their circumference - it should be the same. If
it is not, return the tires for ones that are. If they
are not the same then you will be giving away traction
because you can not dial them in properly. I always
adjust tire pressure before changing the gear ratio.
-
- It has been my experience that increasing the
pressure of the air in the tires decreases the traction,
allowing more slip. When you take air out of the tires
you increase the tire's floatation - you can watch this
happen as the side wall slightly flexes. Reducing the air
from 6 PSI to 3 will be a HUGE difference. Try making
adjustments to the tire pressure in 1/4 to 1/2 pound
increments. Get a really good tire gauge if you don't
have one already. It is very helpful to have a tire gauge
that reads out to 1/10 of a pound of air for precision.
The one I use also reads out in kilopascals making it
very easy to find a good setting.
-
- Since it's always easier to start with more air and
let it out, go to the hill or where ever you are testing
with hard tires (6 to 7 PSI), a friend with a stop watch,
a thermometer, a piece of paper and a pencil. Also bring
an air pump in case you let out too much. Make some tests
with different pressures. Listen to your motor and feel
the hookup. Write down what pressure you are at, what the
temperature is outside, what happened during your run,
what the time was, how you felt about it and any thing
else that mattered during that run. You should be able to
notice changes right away and immediately "dial-out" some
pressures which are far too extreme - in either
direction.
-
- Sometimes what "feels" fast is not. Many times I have
been surprised by a setting which "seemed" fast, but was
slower. It seems that the best setting is one which will
just allow a launch without bog - at the lowest RPM
possible. This allows the launch gear to be fully revved
out AND a powerful grab out of the hole. There are many
theories about this - I have had good luck using several
different approaches - but usually the best one is what
works. Experimenting with YOUR setup will let you find
your ideal launch.
-
- By launching at the same RPM each time you should be
able to dial in a good launch at a specific amount of air
in the tires. Changes in the launch RPM will demand more
testing with air pressures. It is probably best to try to
always launch at the same RPM and adjust tire pressure to
it rather than the other way around. After setting up
your quads air pressure to a particular hill or race area
don't expect it to be perfect for any place else but
there - at THAT time. If you're serious enough about
winning races you'll be adjusting the air in the tires
several times a day - so you don't miss out on any of the
traction or motor that you have. Your tire pressure will
change as the air temperature outside changes much the
same as carburetor jetting. Just as small changes to
jetting can make a big difference, many times a small
change in tire air pressure can do the same. To have a
perfect launch - without a bog or over rev - and hitting
the gears and power band just right is a sweet thing. It
can be duplicated, reproduced and explained.
-
- I usually think of a hill race as having 4 different
parts to it. The launch, the woops, the drive up the hill
and the finish. Dialing in for any one of these areas
changes the way the others behave. There is (almost)
always a compromise in one area (if lucky enough). So
much of hill and flat sand drag racing has to do with the
"woops" at the bottom of the hill or at the starting
area. This is the most important area of the run other
than the launch. Dialing in the tire air pressure is only
going to make nasty suspension problems get worse if the
shocks and their settings are not up to the task at hand.
High quality shocks with compression and rebound
adjustment will help to dial out many problems that are
associated with the bumps. You'll go the fastest through
the rough stuff when the tires are in contact with the
ground for the longest amount of time.
-
- The drive up the hill will be enhanced if the speed
coming out of the woops is high and traction is there
when shifting into a higher gear - the tires have to be
on the ground. When the tires are in the air they're not
accelerating. It is here that careful listening/feeling
the engines power will become most important because over
revving the engine here - or while shifting - will
destroy the drive. It may be more desirable to slightly
under rev the motor rather than over rev since the power
will be ahead of the gear rather than behind it. The
finish is when the motor has achieved the desired RPM in
the gear of choice. If the RPM is too low or too high -
too much of a compromise has been made.
-
- Rick
-
-
-
- Thanks Rick. I printed the
suggestions you made, and when I go to Glamis this week
I'll spend one day just experimenting. Where can I get
one of those good tire gauges you mentioned?
-
- Harry didn't use the Toomeys.
The first thing I did when I bought my Banshee was put on
the Toomeys and change the filter setup. It was a great
improvement, but I wanted to go faster! (Got tired of
getting smoked at the hills!) I went to a local shop to
have the work (porting, etc.) done. The results were not
what I was hoping for so I took the Banshee to Trinity
and started all over. It was an expensive lesson,
considering all the money I spent at the first shop for
porting. Besides being fun, it must be really nice on the
wallet to be able to do your OWN work! I respect and envy
your knowledge and skill.
-
- I still want to go faster! It's
addictive. I know I'll always want to go faster. For me,
there's nothing like winning! I have considered giving up
the sport for something less addictive and less
expensive, like smoking crack! Just kidding of course! I
like long dune rides; however I always seem to head to
Olds in the daytime or Comp at night. You had mentioned
turning your TRX into a hill shooter. I guess that is the
ultimate. I had asked Harry about going in that
direction, he said that when he does big bore,
high-performance mods he likes to start out with a stock
motor. I guess the porting I have now makes it harder to
do what he needs to do to the motor. Not to mention the
price tag for all that work.
-
- Your description of the 4
different parts of a hill race hit it right on the money!
I'm sure reading your message will help make me a little
faster! You have a very analytical mind. Are you an
engineer?
-
- JS
-
-
-
- Don't forget Gecko road for flat sand racing after
things calm down at Olds and before the action starts at
Comp. Usually the action starts 1 - 2 hours before
sundown and is pretty much done just after sundown. I
also like to go on long dune rides. Sometimes riding to
Mexico or Buttercup. When I do it I'll usually gear for
it (14 or 15/36) to get some range and often times change
back to the stock size carburetor for an additional
safety margin. I hate to run out of gas!
-
- I'm in a pretty good position to convert a bike/motor
into a hill shooter since I have 2 engines to work with.
The thing is I really need another frame to do it because
I want my cake and I want to eat it too. I have just
about another complete bike in parts.
-
- The gauge I have goes from 0 to 5 PSI and is marked
off in 1/10 of a lb. increments. Additionally it reads
from 0 - 34 kilopascals. I made it using a Marshall/Town
gauge. I connected it to a small length of spiral Teflon
tubing and ended it with a standard air chuck. It's a
little big and clunky - but as accurate as they come. The
"M" gauges were not accurate enough for my purposes.
-
- If you feel the need - adding Nitrous Oxide will
provide a great bang for the buck. It's safe, effective
and powerful. Dialing in the right jets could easily add
14 - 18 HP (peak) to what you already have. I used to
have it but got rid of it because whenever someone saw
the blue tank they wouldn't race me. Even if I wasn't
using it, if I won, they assumed I was. That bothered
me.
-
- No engine builder has ever had a porting tool inside
a barrel of mine. They have never milled, decked, cut,
CCed, checked or pressure tested any 2 stroke I've owned.
When I race - it is ME that shows up. I never worry about
winning or losing. I just do what I'm going to do and if
I happen to get to the top first - I consider it a bonus.
Getting to the top first doesn't mean I had a good run -
and not being first doesn't mean my run was not
successful. When I race I'm only thinking about MY run. I
don't care what the guy next to me has or what his bike
or displacement is. It doesn't matter. I'd race anyone -
just for the "race" in it. The only time I'm concerned
about another rider is if the driver is too close or
drives in a manner which is reckless. We've all seen
racers "push" others out of the way in order to win.
Though it's not really a legitimate win if one driver had
to back out of it because his "space" was invaded. How
about those guys that come to the line "on a roll." We
all know that a rolling start is a HUGE advantage. Even 1
mph here is major.
Rick
- I know what you mean about the
guys who do the "rolling starts". Whenever I race one of
those guys, if I don't smoke him anyway, the next time I
race I'll just stop and take my throttle hand off the
handlebars until he's stopped.
-
- While we are talking about hill
racing pet peeves, what about the guys who want to line
up almost ON the whoops instead of back at the usual
launch area at the bottom of the hill? I know they are
just afraid of hitting the whoops at speed I consider my
ability to go fast over the whoops a big advantage
anytime I race.
-
- That brings up another
question. Is there a solution that you know of to the
poor shifting on Banshees? Sometimes I lose ground in a
race trying to shift into 4th or 5th. Especially when
I've been racing for awhile (maybe because its hot?), I
really have to bang the shifter hard to get into 4th and
5th gear. Once in the gear it pulls hard and I usually
win anyway, but I wish I had a solution to this problem.
I know I'm losing a split second banging it into the next
gear. Sometimes when it gets really hot I can't hit 5th
no matter how hard I pull on the shifter and I just have
to stay in 4th. See ya,
-
- JS
-
-
- Those guys that want to start ON the woops instead of
behind them are giving us guys (with more power and
better suspensions) an even greater advantage, but they
don't know it - or understand it that way. For us it's
one less area to have to worry about - we'll get our
power to the ground sooner, for them it kills any chance
of getting a drive up the hill.
-
- Trinity Racing sells a modified shift star. They'll
modify yours or you can buy a new one from them. It helps
a lot. In addition to that - get the Hinson clutch basket
and install it. It greatly helps to release the gear you
want to get out of. You have to pull the clutch side
cover to install/replace it. You can tell if your clutch
basket is worn by checking a few things. When you start
up your bike, can you immediately put it in gear without
the bike learching forward and/or stalling? If it clunks
into gear - the basket is worn. Put the bikes rear tires
in the air. Pull in the clutch and put it in gear (don't
let out the clutch), do the rear tires spin? If they do
the basket is worn. When changing clutches - be sure to
use the Barnett Kevlar for additional life, hookup and a
softer pull on the clutch lever.
-
- Under normal riding conditions I never use the clutch
for upshifting or downshifting - except for starting from
a stop. Racing however puts an additional load on the
clutch and gears requiring either a
back-off-of-the-throttle and a clutchless shift, a
chutched shift, or a speed-shift. Of these three I favor
a back off of the throttle - though it's not the fastest.
It does make the gear change a sure thing though, and
fewer missed gears result from it. My favorite way to
shift is under full throttle, without using the clutch
with the help of an electric power shifter. This simple
device shaves time between shifts by allowing full
throttle/full power shifting without very much
effort.
-
- The way it works is simple. Drag racers discovered
some time ago that if they momentarily "kill" the motor
instead of clutching it for shifting that the next gear
could be engaged more quickly - and the power would still
be applied to the wheels and they would not have to let
off the gas at all. The electric shifter comes with a
switch to wire to the gear shift lever, a small box with
a delay control and a small 12v battery to supply
power.
-
- To dial in the setup you need only to set the shifter
switch to kill the motor exactly when you pull up on the
shift lever (when it is ready to change - not just
touching it with your toe). Then adjust the delay on the
timing box to allow enough of a "kill" time for the gear
change to happen.
-
- It takes about 1/2 hour to set it up. Once completed
it will turn your 6 speed into a fully automatic - full
throttle power ride. No need to let off the gas to shift,
no need to clutch for gear changes. No need to do
anything except keep your toe close to the gear change
lever and know when you going to change into the next
gear. It is not uncommon to shave 1 to 2 seconds off the
time it takes to get to the top of Olds. This depends on
how many shifts you're using - but you get the idea. In
addition to the obvious benefit outlined above, it is
easier on the clutch and drive train since power is
always supplied to it.
-
- Rick
-
-
-
- Good stuff. Question: On any of
my 3 Blasters, Once I start it in neural, I pull the
clutch in and press down to first, I get that clunk sound
and the quad moves forwarded just a little for a sec.
This happens on the '92 (low hours) and on my '89 (high
hours, original 89 clutch). The clutches are adjusted
according to specs. and the clutch baskets don't show any
wear. What's going on? They have done this since day one.
I think it's normal, but not sure if I am missing
something.
-
- You Wrote: "My favorite way to
shift is under full throttle, without using the clutch
with the help of an electric power shifter. This simple
device shaves time between shifts by allowing full
throttle/full power shifting without very much
effort."
-
- I want one! What's it called.
Where can I order one? What's it run? Thanks
-
- YFS200
-
-
-
- I used to think that kind of thing was normal too.
When fully warmed up the motors don't usually behave that
way and will allow you to select first gear without a
"surprise." The oil is warm and has expanded. Beside the
fact that while sitting idle - in a garage waiting to be
ridden - the clutch plates stick to each other since they
are very flat and have the transmission oil between them
to promote fluid adhesion - kind of like putting two
pieces of glass together with a small amount of oil
between them. Do this, then try to pull them strait
apart. It is almost impossible, you'll have to slide them
apart. That is fluid adhesion.
-
- I used to deal with this two different ways. First I
would start the bike warm it up (somewhat) and put the
rear in the air. Select first gear - the tires will spin
but should release after several squeezes of the clutch
lever. The other way is to raise the rear of the quad,
leave the motor off, put it in gear, pull in the clutch
and rotate the tires by hand until the clutch plates
become free. It only takes a minute. I have to say that
when I switched to the Barnett Kevlar clutches and Hinson
clutch basket this phenomenon went away. I can start up
my bike and immediately switch it into gear without so
much as a twitch. Though I'm not the kind of guy to do
this I always warm up my motor for a few minutes before a
ride.
-
- The electric shifter is made by Dale Walker.
- Dale Walker's HP (Holeshot Performance)
Products.
- 320 Babe Thompson Road
- La Selva CA 95076
- 408-761-2808 or 408-761-2826
- http://www.holeshot.com/
-
- The area code may have changed. Be sure to specify
that you are using it on a 2 stroke motor and you need it
to operate with a negative grounding system. Expect to
pay about $300 for the complete setup which includes a
handlebar toggle switch - to turn it on/off, the kill
module delay box, the shifter switch trigger, battery
(very small 12v sealed wet cell - also available at
electronic stores like Fry's) and battery charger - I
think it's called a Sure Charge.
-
- Everything installs easily though you may have to
fabricate a mounting bracket for the shifter switch since
every bike is different. I made one in about 10 minutes
out of 1/8" thick by 1" wide aluminum stock. Be sure to
solder all the electrical connections and heat shrink
them when done to keep the water out. If you do it right
you can install the whole unit so you can remove it
without any permanent modifications to the wiring
system.
-
- Rick
-
-
-
- Thanks for the help. I have
noticed that the clunk gets less once everything is
warmed up, but is still there. I always thought that it
had something to do with the tranny having less drag in
neural then needed to brake apart the clutch plates. I
will try that clutch when I replace the stock one.
Thanks
-
- I found Hole Shot's web site
with the power shift listed. Looks sort of simple for
$300. The idea is easy. I think I can build a
better
- one for less (or with my luck,
more) that can run off a 9 volt battery for a week, (or
make a battery less version) that's better. Maybe having
an auto engage feature where it only power shifts if the
RPM is above a set point. Say 7,000RPM. Then it will be
there when I need it and off for cruising. Lots of ideas.
Thanks for the info.
-
- YFS200
-
-
-
- You might be on to something there, but it's also fun
to drive the thing around at low revs without letting of
the gas. As it is the 12v version runs quite a while
without a recharge - at least a couple days of riding -
and it charges up in about 4 hours. The battery itself is
about 2"x2"x4" long - it's pretty small. You could use a
rectifier but they tend to produce voltage spikes which
are not very welcome. I've seem nitrous users try
powering the solenoid system with them without much
success. Though those solenoids draw much more
power.
-
- Rick
-
-
-
- Hey guys, been reading your
thread here, and a damn fine one too.... not trying to
stroke egos, but very informative and relevant info for
all of us that seek to get to the top of the hill
first.
-
- I've had the experience of
switching to the Cascade Billet shifter on a Banshee. My
Honda's shifter(stock) seemed very positive compared to a
stock Banshee shifter. When I hop on a friends ride it
takes me a pass or two before I get comfy with a Banshee
shifter. Well.... I broke one once, and if I break it I
fix it... and all that they had was a Cascade shifter,
and it makes a difference, on Banshee's don't know about
Honda's(but have eyeballed the Denton linkage shifter
once or twice-any experience??). The shifts seemed much
more positive, not spongy..... The shift star mod is
actually pretty simple to do, a friend had a local shop
do it and I traced it onto paper, and have mod'd several
since. All that was done to his was rounding the points
of the star about to a .250 Radius on each
point.
-
- I've also found, and this is
with the Mk 1 seat-o-matic dyno, that shifts seem more
positive and clutch uptake is smoother, by running
synthetic oil. Yep it's $5 a quart, and I change it after
every weekends ride, but it's my opinion that synth. is
better. While we're talking gear oil, ever run 10W-30 oil
in your tranny? Don't. 30 weight oil and 75W-90 gear oil
have the same viscosity, just measured at different
temps. I've read several places, the most recent at Red
Line oil's Home page, that the polymer strands in gear
oil actually get cut up by the meshing gears. The extreme
pressure additives(EP) in gear oil provide the necessary
lubrication under those conditions, and motor oil
doesn't. Haven't heard of anyone having problems that I
know of(do know one knothead who runs it), but the cost
of tranny parts and case halves........
-
- Rick, tell me more about
running Amsoil mix oil???? I noticed that you run it at
80:1, what have been your wear characteristics with it???
Ever thought about blending nitromethane??? Lasts longer
than nitrous, with decent performance gains........and
less hassle than methanol.....
-
- Backcountry
-
-
- This has been a good thread. I always get a little
carried away with my ego especially about building
engines for myself and friends - what to say... sorry if
I come across a bit STRONG WINDED.
-
- The Banshee shifter is VERY weak. Part of this is
because it is so long. Banshees have a vague feel to
their shifter and like you it takes me time to get used
to them. I have welded many of them with reinforcements
added to make them stiffer. I too have had experience
with the Cascade shifter on a Banshee and it is a VAST
improvement over stock. The shift star modification is
easy to do, but try not to lose the small hardened pins
that are part of the assembly. They're easy to lose if
you're not careful.
-
- I looked (and bought) a Denton shifter a few years
ago. I found it was very nice but stuck out way too far
for my size 12 boots so I returned it. I (basically)
copied the design though improved it a lot and the result
is on my bike right now. The shifter is perfect. It is
adjustable for height, throw and tension. I did not give
it an adjustment for distance since I dialed it in for MY
foot (toe). I consider it one of the best improvements I
made to the bike. From it I connect a Dale Walker
electric power shifter.
-
- Like you, I too change my tranny oil VERY frequently.
Every ride weekend and often times once during the week
while at Glamis. It depends on what kind of riding I've
done though during that week. I don't always race all day
long. Sometimes I just cruise around taking it all in.
The oil I use in the tranny is 10w40 Amsoil (synthetic)
in the fall (cooler months) and 20W50 Amsoil in the
summer. My premix has always been lean (80:1) compared to
what a lot of other people run.
-
- I used to run air cooled Odysseys (250 & 350 cc)
and ran their oil to gas mixture at 100:1 using Amsoil.
Eight ounces of oil to 6 gallons of gas. As far as I know
I never suffered an oil related breakdown, though I did
hole a piston or two due to improper main jetting.
Internally everything was always fine. There was never a
lack of oil in the motor. We ran the heck out of them.
Everything was always fine. There was never a lack of oil
in the motor.
-
- When I got my TRX in 1986 I chose 80:1 a nice round
number - since it was 8 ounces to 5 gallons it mixed in
well - where the heck are those 6 gallon cans anyway? I
jetted for it and received the benefit of less gunk in/on
my motor, fewer oil foiled plugs, easier to read plugs
and improved performance since the less oil going through
the motor the better off everything is. I understand the
Karting guys mix their Amsoil at ratios as high as 150:1
and even higher. I've run this way for 12 years. I
finally wore out my first TRX crankshaft this past
spring. The main bearings had too much side/end play. It
still ran well but when I took it apart for inspection it
was way out of tolerance. That crank has been through a
330 kit , a 300 kit, a Pro-X 310 Kit, several years at or
around 270 cc, and the first bunch of years at 250
cc's.
-
- As far as cylinder wear - it simply does not exist,
or should I say it is VERY low. Since I always bore a
barrel with a torque plate installed - 3/4" thick plate
torqued to the proper specs while boring/honing - I have
excellent results with the roundness of the bores and
with proper attention can get the holes very strait as
well. This is a (sort of) a speed secret that automobile
drag racers have been using for quite some time. It works
well for 2 strokes as well. Especially ones with pistons
that are more than 2 mm oversize. When you put a head on
a barrel, torque it down and check it with a bore gauge,
it is not uncommon to see variations in the bore
especially at the top of the bore (of up to .001"
directly in line with the hold down bolts - in all 6
places) where it is most important for the rings to do
what they do - seal the pressure. Curing this makes
cylinders not only last longer but its associated parts -
pistons and especially the rings, not to mention the bore
itself.
-
- At one time I thought it was wise to coat parts with
moly assembly lube, or to oil the parts real well during
installation to prevent any gauling during the first few
minutes after startup. I learned that lightly oiling the
parts with WD-40 or a VERY light coat of motor oil is
PLENTY.
-
- As far as special fuels are concerned, I've stayed
away from nitro and alcohol. Perhaps if I had a single
purpose hill-shooter I would do it. Nitrous was fun, but
I like running gas alone better. At over $4 a gallon for
the 110 octane stuff and my gas mileage being as crummy
as it is, I don't think I can afford to bring much more
gas with me on those week+ long trips down there. As it
is I'll easily burn 35 to 50 gallons in 9 days, and that
includes taking a day or two off to visit my favorite
places in Mexico. I changed to my other motor for my most
recent trip to Glamis. Now I have to redo the crank from
the original motor and am thinking about my possibilities
and options with it - there are many.
-
- Rick
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