WRENCHBENDER
New Member
- Local time
- 9:53 AM
- Joined
- Jun 9, 2010
- Messages
- 7
Well I have about 93 miles on my engine and I ride it alot and one day on my way home from work the motor suddenly started to miss real bad and then it just shut down. while i was coasting with the clutch out i could hear the oh so familiar sound of engine failure. pedaled the rest of the way home and immediately started to tear down the engine. First bad sign was aluminum peices rattaling in the exhaust pipe. so what happened was the wrist pin had traveled past the side or the piston and tore a big hole in the transferr port. Peices of metal and the c-clip were all over and smashed the spark plug shut. but was it my fault. I have modded the engine a little. port matched the intake and exhaust,re-jetted the carb from .030 to .025 and it ran alot better and could get some more rpm from the engine, no more four strokin. Dont get me wrong I wasnt babying it. I started to get real bad vibrations when i pushed it over 32 mph. I got up to 34.9 mph on a 44 tooth gear if my speedo was correct and i know i have gone over 30 mph. It would vibrate so bad over 34 mph that the gas would leak from the tank neck. However the material between the wrist pin clip and the side of the piston was very thin in my opinion and was thicker on the other side. Was it a failure of the clip or did the metal of the piston give way and lost the clip. Has anyone put internal c-clips on the piston or whats a good replacement tip. so let me know your input and now im in the market for a new top end. Also i was still running the 16:1 ratio and have changed the spark plug to a better n.g.k. plug that was running fine for a long time.