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Old 07-30-2012, 11:09 AM   #27
Twin-shocker
Beastly Adventurer
 
Joined: Jan 2012
Oddometer: 1,673
If you dont change jetting to accord with atmo conditions when running on the dyno, you will be losing a fair amount of power, but more importantly will have no real idea whether or not changes to ignition are simply compensating for weak or rich mixture rather than making the motor work better.

You will also have major problems if the squish clearance has not been corrected, as this will mean greatly increased piston crown temperature, and increase the chances of detonation, as well as reducing MSV.

Effectively tuning a 2T motor is in many ways far more complex than a 4T, due to the amount of difference that will result from changes in heat/pressure, and is certainly not something for someone without a fair amount of previous experience of this type of work.
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