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I let it run for a couple of minutes but it got really hot so I shut it off, and I’ve tried to richen it up but I can’t anymoreIt's second hand? Was it clean when you got it. Maybe the other person coated it with WD/40 or something to make it look good in pictures. Did you notice anything when u got it.You rebuilt the motor/piston. Perhaps you got some oil/fuel on the head. Or maybe got some crap on it while laying on work bench.And it might be burning off. Sometimes the glow plug backs out and let's out a little fuel that will build up on bottom and burn off and smoke. Did you let the motor run for longer then a minute.
I set it to the factory settings and it got to hot so I’ve been richening it up and it’s making no differenceWhat do you mean bud. "You can't richen it anymore". Why's that? Did you pull up the spec from the manufacturer. To see what factor settings are for that motor? So your starting in a good range for that motor and not to lean. Did you pull fuel threw it after you rebuilt it to get lubrication in the cylinder before you started it?
Probably as mentinoed, you may have a crack elsewhere, causing it to run lean.I set it to the factory settings and it got to hot so I’ve been richening it up and it’s making no difference
Thank you I have just cleaned the carburettor out and it has seemed to fix it, it’s still running a bit hot so it will just need a quick turnA lot of time when it runs lean, is a clog up carburetor, air leak is another. Before I run any engine that I got without history, I always clean the carburetor first, replace or check all fuel lines.