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If you read my post you'd see that the Seafoam went in behind the valve onto the stem ONLY to use it's solvent properties. Nothing added to the oil. Yes the motor shroud was taken off and all was clean, as you'll see in an earlier post I replaced the head gasket.

Thought I would add a final post about my mower issue. After leaving the mower for a week it wouldn't start again after freeing the exhaust valve with choke cleaner. I removed the plug and the exhaust valve is visible. I rotated the crank to the point where the vavlve should be closed and gently...

It may well have done but strange part was I eventually got it running by blocking open the choke and it ran great for an hour while I mowed the lawn. Didn't turn it on it's side after that and the next day it wouldn't start at all. Ripped into it and found the exhaust valve stuck open about...

Problem solved. Freed up sticking exhaust valve by spraying stem with carb cleaner then gently tapping valve head with hammer and wooden dowel to seat it properly. Put back together and it's running fine. I'm just wondering if an additive like Sea Foam can help prevent exhaust valve sticking...

OK so I blame not spotting a slightly opened exhaust valve on my 77 yr old eyesight. Need cataract surgery. I measured the clearances and the intake was .007, the exhaust a whopping .030 Yes it was stuck open a bit. I have it freed up now using carb cleaner. Any suggestions for anything else to...

I will check the clearances. I'm not familiar with how ACR works physically. Does it rely on the shape of the camshaft lobe or is there some camshaft movement due to centrifugal force. I better do some research on that. Thanks everyone for the helpful suggestions.

This engine is a flat head / side valve design. Does that type of Briggs & Stratton have compression release? I'm using the electric start to crank it over at a pretty good clip and not seeing compression. Is it possible for the compression release to fail and remain activated when the engine...

Thanks Ilengine. No I can only rotate the valves when they're up off the seat, gripping the valve edges with my fingers. I'm just really surprised that I can't see any movement on the compression tester needle. Same with putting my finger over the plug hole, can't feel any pressure at all. Even...

Our Toro mower with this engine started first pull after the winter. Ran fine for first lawn cut. Put mower on its side to clean under deck then as I usually do tried a restart. It wouldn't start so put away figuring probably just flooded. Got it out the other day and it wouldn't start. Pulled...