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Message: [QUOTE="Uchytil, post: 1411705, member: 43803"] Advise? If you replace the main seals (on the crank), and have a correctly installed PV, and all the other crankcase sealing points, ie. reed block, jug, PV, etc. are new and tight, you could do a crankcase pressure test which is hard to get exact without the proper sealing tools. I use a machined piece that fits into the carb. boot that has a port & needle valve to allow air in (or vacuum) from a hand pump. I use about 2-3 psig and allow it to set a few minutes to watch for drop. Newer bikes (meaning ones with multiple sealing areas) can give false readings at the PV seal which (in my testing) has never been very good for sealing. I'd say if the seals are all new go back to stock jetting and start over. I still think the steel liner and domed piston are mods that may have affected the mill. Good luck. [/QUOTE]