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Thanks all, I’m going to pull the inlet manifold and make sure it’s free of debris. Hopefully get to grind my first stump soon.

Anyone know what this is? Heavy for its size and magnetic

Piston

Small piece of magnetic metal stuck to head Could be a spark plug electrode but who knows

When it was left out in the rain anything could have been dropped down the open mouth of the carb

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.

It’s got a click with the rods out

Must have been the inlet valve that let go, nice new bits but guide and rod not replaced????

Valve guide pictured, been a bit mucked up but I can’t see the rod or guide making this noise.

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...