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Ok, that is NOT jetting. I agree that it will save your motor, but all it does is change your timing (which will richen or lean out your mix in a way) but it WILL NOT change your MAIN JETS which regulate how much fuel enters the motor.
I still believe that your motor AFR (air fuel ratio) is leaner at -20 than it is at 25. As a result you have more power...and thus more top end.
Smallengineguy can you comment?
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