bike lacked compression so I threw in a Wiseco piston and there's still no compression when I try kickstarting. I just checked my valve clearances and they're good. Does anyone know a good way to check if there's a pressure leak through the valves?? Any other possible problem?? Any info would be greatly appreciated, thanks! info on the bike: I've had the bike less than a year and it recently had less compression every ride. Eventually I could only bump start it. Now it wont even do that. Carbs good, engine's getting fuel, and just replaced the spark plug and its got a good spark.