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[QUOTE="pro2k, post: 914162, member: 36481"]
Butane, I built the diy leakdown tester and pumped it up to 8psi and the pressure fell rapidly. I made up some soapy water and sprayed it around the cylinder gasket and reed cage area and then pumped up the pressure. It immediately began to fizz and bubble around the cylinder gasket. Well, I took the cylinder off applied a little gasket sealer at the problem area, put it all back together, and pumped it up to 8psi. No leaks and the pressure didn't drop off at all after a couple minutes.  I haven't been able to take it out to the track yet but I'm almost 100% sure that leak was the problem.  If you are having the same problems and the top-end was recently rebuilt I would suspect an airleak. Your bike is also a little older than mine so it could quite possibly be that crank seal Faded was talking about. You can squirt some baby powder around the gaskets and run the engine and the powder will highlite the area (or so I have read). But for less than $30 you can make the leakdown tester and know for sure if you have an airleak. Good luck and let us know what you find!
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