[Eric K]

Since the exhaust pipe o-rings were cooked, I replaced the head o-rings. The ‘overheated’ head o-rings were still pliable and intact. There were trace amounts of carbon on the piston and head which I cleaned off. The carbon was baked on.

Here are the compression measurements…

After rebuild ~12 hours ago prior to break in 185 psi (me kicking)
After overheating 182 psi (son kicking)
After overheating and replacing head o-rings 205 psi (me kicking)

I attribute this recent increase in compression to me kicking faster than my son (I have a 60+ lb weight advantage) not to the new head o-rings. I attribute the increase in compression since the last rebuild to ring seating. Overall, great compression and the engine runs just as well as it did before.

The leaking water pump seal did not have any visible damage. The LTR impeller looked fine.

After 3 oil changes with short rides in between the transmission oil looks clean.

I continue to be impressed by the robustness and durability of the GasGas 300 engines, except for the waterpump seal which I have changed a total of 5 times on my ’01 XC300 and ’06 EC300.