the RPM range dictates over what RPM range that the timing boost comes in, so a shorter rev range will mean the timing advance will come in faster, so by upping the end RPM will soften the motor a little, dropping it makes it more aggressive.
The TA05 has equal length belts, and under acceleration, the rear belt takes the greater loading, so you have to run that a little tight, but the front can run a little loose.
Steve
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