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Would have been great and a simple fix but no luck there.

That was an excellent and well timed post. My carb clean instructions simply say to "remove" and I have been looking at it wondering how it could unscrew... So pryed it out as you said: to find it blocked as far as I could tell, and with only one (and broken) o-ring. Not sure what size "super...

Don't know this particular engine but most of my tractor/mower manuals have a chart in them for the grade: it will be different for your climate and temperature range.

I think I have eliminated some of those with what I've done so far (see above) but cap not venting is something I hadn't thought of. Not sure how valve lash would cause this run....won't run....run....won't run Otherwise, probably a more thorough strip down and carb clean is next... Thanks, your...

A non-starter this morning, (after some months unused) and after fresh fuel and a quick carb clean: The engine starts smoothly, and seems to run great. After a minute or two, it starts to cough, splutter and backfire, but mostly doesn't stall. Then after a few seconds (10? 20?) it then bursts...