Blaster Limit - T.O.R.S. - Available On Yours

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- Blaster Limit -

T.O.R.S. - Available On Yours

The Question - Me and my father have been debating for some time about two strokes. I just bought my blaster a month ago it is a 99. My father thinks that I am over revving it and I tell him that two strokes are made to be revved high. Is this true can any damage come of high revving in 2nd or 3rd gear.

The response - Well, that all depends. Most two strokes are tuned to make peak HP at or around 7500-8000, obviously some lower some higher. Importantly, what does it "feel" like when you're riding it. Does it rev to a point but then not gain any more power--goes "flat"... that's over revving. You've exceeded the designed and tuned abilities of that motor to create more power. Over revving all the time, yes, can/may lead to premature failure of parts. If the motor is still developing power, it is not over revved.

HOWEVER!!!! With an air-cooled motor like on your Blaster, be aware of slow ground speeds(putting along) vs. motor RPM (higher RPM's). They can develop heat quickly that will cause motor seizure, due to the cooling is provided by air circulating around the cylinder. Don't let it sit and idle for extended periods of time as well.

Backcountry

Doesn't that motor or more specifically the carburetor have some sort of RPM limiting devise attached to it? If I remember correctly it does and comes on about 7000 or 7500. It is not uncommon to run up against the rev limiter while running that motor - though selecting a higher gear may be appropriate when necessary.

While proper jetting is always very important, I wouldn't worry about over-revving it very much. With the engines short stroke, there is very little chance that the piston speed would ever come close to the speed it would take to make the piston fail because of it. If you remove the RPM limiter - that's different.

Rick

I don't think there is a RPM limiter on a Blaster. I have hit 8,000 RPM (TinyTach) on mine with out a miss. And with a Trinity pipe it will rev higher.

YFS200

A Blaster has a rev limiter called a THORS system it is the weird shaped box on top of the carb. The other part of the system is a switch in the throttle. The system can easily be disabled by disconnecting a plug under the plastic nosepiece. If your machine has a twist throttle the whole system would be missing. After I disconnected the limiter on my Blaster it not only revved higher but also quicker. I had to disconnect the system on mine because of failure, and a new unit costs over $200, but I would now do it on any Blaster just to make it rev quicker. Banshees also have this system but I'm not sure how to disconnect them because they have two carbs and two units.

Blaster

I think you are thinking about the T.O.R.S system. "Throttle override system (T.O.R.S) is incorporated in the ignition circuit, and of the system should fail, no sparks will develop on the spark plug." -Owner Manual. It's job is to kill the engine if the throttle cable becomes stuck, or in my case, if I reassemble the carb wrong with throttle valve stuck open. :)

Take a look at the wiring diagram. If it was an rev limiter it would need a way to measure the RPM,s. There is none. I can't really explain how you got a higher RPM and better performance by disconnecting a system that has nothing to do with the performance of the engine. If it has a rev limiter (if so it must be set at 9,000 RPM because I never hit it.) It would be built into the CDI.

YFS200

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T.O.R.S. - Available On Yours
The Question - Me and my father have been debating for some time about two strokes. I just bought my blaster a month ago it is a 99. My father thinks that I am over revving it and I tell him that two strokes are made to be revved high. Is this true can any damage come of high revving in 2nd or 3rd gear.
The response - Well, that all depends. Most two strokes are tuned to make peak HP at or around 7500-8000, obviously some lower some higher. Importantly, what does it "feel" like when you're riding it. Does it rev to a point but then not gain any more power--goes "flat"... that's over revving. You've exceeded the designed and tuned abilities of that motor to create more power. Over revving all the time, yes, can/may lead to premature failure of parts. If the motor is still developing power, it is not over revved. HOWEVER!!!! With an air-cooled motor like on your Blaster, be aware of slow ground speeds(putting along) vs. motor RPM (higher RPM's). They can develop heat quickly that will cause motor seizure, due to the cooling is provided by air circulating around the cylinder. Don't let it sit and idle for extended periods of time as well. Backcountry Doesn't that motor or more specifically the carburetor have some sort of RPM limiting devise attached to it? If I remember correctly it does and comes on about 7000 or 7500. It is not uncommon to run up against the rev limiter while running that motor - though selecting a higher gear may be appropriate when necessary. While proper jetting is always very important, I wouldn't worry about over-revving it very much. With the engines short stroke, there is very little chance that the piston speed would ever come close to the speed it would take to make the piston fail because of it. If you remove the RPM limiter - that's different. Rick I don't think there is a RPM limiter on a Blaster. I have hit 8,000 RPM (TinyTach) on mine with out a miss. And with a Trinity pipe it will rev higher. YFS200 A Blaster has a rev limiter called a THORS system it is the weird shaped box on top of the carb. The other part of the system is a switch in the throttle. The system can easily be disabled by disconnecting a plug under the plastic nosepiece. If your machine has a twist throttle the whole system would be missing. After I disconnected the limiter on my Blaster it not only revved higher but also quicker. I had to disconnect the system on mine because of failure, and a new unit costs over $200, but I would now do it on any Blaster just to make it rev quicker. Banshees also have this system but I'm not sure how to disconnect them because they have two carbs and two units. Blaster I think you are thinking about the T.O.R.S system. "Throttle override system (T.O.R.S) is incorporated in the ignition circuit, and of the system should fail, no sparks will develop on the spark plug." -Owner Manual. It's job is to kill the engine if the throttle cable becomes stuck, or in my case, if I reassemble the carb wrong with throttle valve stuck open. :) Take a look at the wiring diagram. If it was an rev limiter it would need a way to measure the RPM,s. There is none. I can't really explain how you got a higher RPM and better performance by disconnecting a system that has nothing to do with the performance of the engine. If it has a rev limiter (if so it must be set at 9,000 RPM because I never hit it.) It would be built into the CDI. YFS200