did you do a leaktest?? very important
A steel or aluminum plate must be bolted onto the exhaust side of the cylinder using a piece of rubber as a gasket.
A round fitting with pressure gage attached should be clamped into the intake manifold on the cylinder.
With equipment in place, use a hand pump to fill the sealed engine with 6-8 lbs of air pressure.
Once 6 lbs of pressure is pumped into the engine. Set a timer for 6 minutes.
Engine must hold a full 6 lbs of pressure for 6 minutes without any loss.
A tight motor should be able to hold this setting for more than 10 minutes without losing any air.
Rule of Thumb The normal bleed-down pressure loss is 1 psi per minute.
If gauge shows a loss of pressure, squirt all gasket surfaces with a water based soapy solution (Windex, 409, etc.) If there is a leak at any surface you will see soap bubbles. Re-torque any areas that leak.
If you cannot locate the leak by looking externally, consult a qualified two stroke mechanic.
If after 6 minutes the gauge shows no loss in pressure, remove testing equipment and continue assembly of machine.
Building your own pressure testing device. All parts can be found at any good hardware store. total cost should be around $15.
Got this from another website , good info , I'm gonna put together a tester for myself as well , much respect to holeshot but if I can make it myself I shall , its just in my blood like that . He's right about pressure testing , without doing it , you just don't know .