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With my bike, the main jets are always slightly too rich. It you are going the burn valves or pistons, it will usually happen when you are using full throttle. However I run the needle jets as lean as possible right down the needles. With lean needles, you tend to feed the throttle on rather than whack it open. I do not believe this stuff about high compression helping the cam to work. It might make the effect of the cam more pronounced, but the timings have the same effect at any compression ratio. - They change the power band and provide better cylinder filling. As you raise the compression ratio, you do similar to leaning-off the jetting or further advancing the ignition timing. Doing any of those things will improve performance of many motors. The risk is in going too far, when you do them without being aware of the symptoms. Some guys do not know when their motor is running too lean. If my motor misses. I usually go straight back into the pits and fix it.Combustion conditions depend on three things - fuel mixture, compression ratio, and ignition advance. Regardless of compression ratio, you can usually end up in the same place by juggling the other two variables. Methanol fuel makes it much easier because the jets flow twice as much, the tuning errors are halved. - 'there is a fine line between pleasure and pain'. Poms are better than Australians at this stuff.
With my bike, the main jets are always slightly too rich. It you are going the burn valves or pistons, it will usually happen when you are using full throttle. However I run the needle jets as lean as possible right down the needles. With lean needles, you tend to feed the throttle on rather than whack it open. I do not believe this stuff about high compression helping the cam to work. It might make the effect of the cam more pronounced, but the timings have the same effect at any compression ratio. - They change the power band and provide better cylinder filling. As you raise the compression ratio, you do similar to leaning-off the jetting or further advancing the ignition timing. Doing any of those things will improve performance of many motors. The risk is in going too far, when you do them without being aware of the symptoms. Some guys do not know when their motor is running too lean. If my motor misses. I usually go straight back into the pits and fix it.
Combustion conditions depend on three things - fuel mixture, compression ratio, and ignition advance. Regardless of compression ratio, you can usually end up in the same place by juggling the other two variables. Methanol fuel makes it much easier because the jets flow twice as much, the tuning errors are halved. - 'there is a fine line between pleasure and pain'.
Poms are better than Australians at this stuff.
