20-10-11, 03:47 PM
Don't worry too much about mileage, I only changed my first engine at 115k miles because piston slap was making it sound like a tractor... but it'd probably have gone on for years. Valve clearances never changed in all that time.
It's worth checking the transition from first to second gear... if it drops out of second when you give it the beans, it's one to avoid.
Only other problem area on the engine I can think of is the front sprocket nut, original one supplied was too shallow and tended to strip its thread. I had that happen several times, though the thread on the shaft survived somehow.
It's worth checking the transition from first to second gear... if it drops out of second when you give it the beans, it's one to avoid.
Only other problem area on the engine I can think of is the front sprocket nut, original one supplied was too shallow and tended to strip its thread. I had that happen several times, though the thread on the shaft survived somehow.