I ended up rebuilding the top end, new piston, rings, valve springs cylinder gasket upper and lower.
What I noticed after I assembled the bike were a lot of black particles in the collant when I flush the radiator. The particles appeared to be solidified grease. After four flushes there was still a significant amount of particles in the coolant. I did run the bike in between flushes.
Is it possible for the cooling system to get stopped up? Coolant not flowing, excess pressure in the system.
What are signs of a bad water pump?
Almost looks like it's leaking from the base gasket. Gaskets are new. Should I use some of that copper gasket stuff?
The bike ran well otherwise, start in 1-2 kicks, better compression than before.
Edited by YZ Yankee, December 28, 2015 - 08:51 AM.