- The question - I see that you have and are
using an EGT gauge to tell you how hot you are running
while at speed. Have you ever used a devise called a
"Dial-a-Jet"?? It allows you to adjust the main up or
down 5 whole steps from your baseline jetting, from
outside the carb. You just twist a knob. You can do the
adjusting from the seat (with a little practice) and
notice a change in temperature on the EGT right now. Now,
we don't have one, so we don't know how it works in real
life, but when you yank off the paddles for the run
"south", the kit sounds like THE hot setup for quickly
re-jetting and saving the motor.
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- The response - Actually I have used one - or
something like that several years ago. I used to have one
on a Honda Odyssey 250. It was a Mikuni version. What you
did was put in a main jet about 10 sizes larger than the
largest you'll need. Then the knob on the carb would
meter the fuel from there. If you ran a cable to it in
the right way and kept one eye on the EGT you could lean
it out as you went down the straits, then turn it back
when needed. I think it gets the job done, but in kind of
a messy way. That is to say - I think standard jetting is
much more accurate. I always buy genuine Keihin jets -
NEVER use the generic ones! I think the same is true of
the Mikuni parts. Why risk a several thousand dollar
motor over a three dollar jet.
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- -I'll let those who don't know in on a little jetting
secret - but they have to promise not to tell...
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- Jetting is NO BIG DEAL!!!!!!!!!!!!!
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- What is a big deal is all the rhetoric surrounding
it! The most important thing to remember when jetting is
that you're jetting your motor. Not a motor like your
buddies or a friend of his. When jetting - only think
about jetting. It's best not to make a run, have a
sandwich, change a jet. Then make another run, chat with
your friend, change a jet, drink a soda and eat some
guacamole. Then "oops, did I change that jet... ummm
larger or smaller."
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- Anything worth doing is worth doing right <- not
my invention. Concentration will pay off. There is no
mystery. A spark plug that's looks rich IS rich. A spark
plug that looks lean IS lean. Get a loupe. A jewelers
loupe. Pull the plug after one good plug chop on a clean
plug and look at it. Read it where the ceramic meets the
metal case. Not where the center electrode meets the
ceramic. This is very old technology and is still
relevant. The fastest engine tuners in the world still
pull plugs and look at them.
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- The EGT is a gift and a time saver. A quick way if
you will to get very close to ideal without looking at
the plug. It aids in jetting - it does not replace
looking at plugs. I still do plug chops. What changes is
that when I do plug chops I can note the exhaust gas
temperature and other variables. This is good technology.
Once I have a baseline dialed in, I can change from there
with complete confidence - (read - RAD).
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- On trips to Mexico or anywhere else stopping to
change a main jet takes about 3 minutes on a TRX. I feel
bad for those Banshee owners who have to take a roll away
with them to change a jet - especially if they opted for
the 35 mm PWK's. Not only does their motor burn fuel at a
rate of 3 gallons to my 2 gallons, the overall power to
weight ratio of their bike is LOWER! UGH!
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- Rick - see http://www.holtzmaneng.com/index.html
for information using this jetting device, or check out
the company whose product actually carries the Dial-A-Jet
name - http://www.thunderproducts.com
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