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Loaded up and ready for a 4 day trip, been planning all year




Nope
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150km into it and the engine locked up solid at 90kph. Kept it upright and loaded it on a truck back home. No loss of power or funny noises so I didn't have much idea of what might have happened, I thought maybe cam sprocket bolt had come out or something.

Nope it's dropped a valve. A bit strange to do after 400km of riding on current set up. I was really taking it easy today, just cruising at 80-90, so it didn't happen through bounce.

I have gotten the engine good and warm and done high rpm shifting and had no issue.
Might be that the big cam and 150cc piston don't work together (but again why not happen when I was thrashing it) I never measured clearance tbh, but I did put a second base gasket in to help with piston combustion. Maybe the timing chain slipped a tooth or the valve got hung up in the guide