surely there is enough piston head clearance for a butterfly screw? I’d expect it to have pinged out the exhaust valve, could be stuck under a valve.
The more I think about it the more I think decomp off the cam, but yes should probably bite the bullet and pull the head or side cover.
Heads have not been removed. Uncanny thinking mate. After being left in the rain the carb was seized, I ordered a new one and when I pulled the old one the butterfly fell out on the bench. Could well be a bit of metal mashed to the top of a cylinder.
What’s easier to pull, head or side cover?
Good idea Bert, piston pin and big end seem fine. Still have this binding problem just before tdc, thinking it’s time to pull the side cover and have a look.
Yep every time no1 hits tdc, just before it make a clack if you free spin the motor by hand. This could be the noise, also had a look and the pushrod is only just bent, I’ll order one of these and the guide is bent back into shape .
Hi all
I purchased a Vermeer stump grinder with a Honda GX620 on it. I knew the motor had problems and would like some help and direction before I tear it down.
The motor had thrown and bent a push rod 3 years earlier and the thing was abandoned and left in the rain for a period of time.
Water...