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Back to this problem after some time on other projects... With a fuel tank clean, new in-tank filter, and fresh fuel it is just the same: Starts well and runs on low revs nicely, dies or nearly dies after a minute or so on full revs So I've looked in another direction: If I take the drive belt...

I'm in UK, so standard grade petrol/gasoline has 10% and "super" 5% Ethanol. So we have to live with that... having said that it normally works fine, I think as long as the engine is in regular use. I use an alkylate like Aspen or an additive over winter on anything which is not in regular...

I am going to take the tank off and clean it (again) but I am a bit uncertain this is going to help: if I take the fuel line off the carb then fuel literally jets out. The engine is not really hunting and surging: it virtually dies with just a few pops and coughs... then usually recovers. If I...

Still struggling with this one; after carb clean and new pilot jet, fresh fuel, just to recap: The engine starts smoothly and easily, and seems to run great at low revs. After a minute or so at high revs, it starts to cough, splutter and backfire. Then it may burst back into life and seems to...

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...