Pitting on top of Piston and Head

[Shibby]

My 1994 Honda CR125R has pitting on top of the piston and the Head. Is something getting past the cylinder? Maybe a bearing? I have the motor out and plan to rebuild as much as possible. I need some help finding a gasket kit, cylinder kit etc....Any help would be greatly appreciated as to why this is happening.

Steve

 

[dirt bike dave]

Probably detonation.

You should check with service honda for your parts needs. The have good prices.

 

[Beuford]

I would throughly check the bottem end bearings for any roughness or play.

 

[whenfoxforks-ruled]

Look carefully at the exhaust edge of the piston. Kind of eroded away? A needle bearing can let loose and pit both, and some gouging.