Here is what else I found...
No oil in the cooling system.
Compression measured 182 psi. It was 185 psi just after rebuilding the top end 12 hours ago. (Note: Since my knee was sore, I had my son kick it for the compression check and he did not kick it quite as fast as I did on the previous check.)
The water pump seal was replaced when I did the top end rebuild 12 hours ago. It had worked fine until the last ride. There was no visible damage to water pump seal. The LTR impeller looked fine.
The spark plug looked good - a light brown electrode.
I took the pipe off and looked in through the exhaust port. From what I could see the piston, rings, cylinder, head and power valve look normal.
The exhaust o-rings were the only thing I could see adversely affected by the heat. They were brittle and broke into pieces.
Once I get a new water pump seal it looks like it will take a number of oil changes to flush out the milky gray oil/coolant mix.
Note - this is on the '06 EC300.
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Eric K
'06 GasGas EC300
'01 GasGas XC300
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