This is to test the compression on your cylinder. This should should be done with the gas on and the throttle held wide open for an accurate reading. 110-130 is the ideal range for most two stroke engines. Below will be difficult to start and run poorly if at all. Above 130 psi are for higher tuned motors which usually have performance cylinders, larger carbs, and larger exhaust pipes. Above 150 psi requires better than pump gas and is usually only found on liquid cooled cylinders very high performance bikes.
This is to test the compression on your cylinder. This should should be done with the gas on and the throttle held wide open for an accurate reading. 110-130 is the ideal range for most two stroke engines. Below will be difficult to start and run poorly if at all. Above 130 psi are for higher tuned motors which usually have performance cylinders, larger carbs, and larger exhaust pipes. Above 150 psi requires better than pump gas and is usually only found on liquid cooled cylinders very high performance bikes.