Hi guys I am a newbie and very new to pwc's. I have a 2003 yamaha gp800r, my problem is that while running it will die and after further look into it I noticed the spark plug was getting shut. I guess the Liston is barely hitting it and closing the gap on the plug. I had the motor rebut by a local dealer about 2 years ago these belong to my in laws at the time and they never did anything about the issue after the rebuild. Now I bought them from my in laws and plan to fix the problem. I am fairly familiar with engines and things like that, is there a chance that the gasket that was put on the heads is to thin maybe the wrong one and it is causing the piston to hit the plug?