seems no one here knows of cranks seals on a 2 stroke. they will keep you from running. my ody had 120psi, carb had fuel, great spark, etc etc. i talked to a few shops and finally one reminded me of the seals. if your bearings get out of tolerance, it will allow the crank to sit on the seals and open it up releasing the pressure in the case. the ody runs a vacuum pump off of the crank case. it was weird. anyway, have fun