I should have mentioned, it does have fresh plugs and I've put 10 hours on it since I've acquired it in September, so lots of gas has gone through it. I even installed new fuel and air filters.I would start with a fresh set of spark plugs, drain the fuel tank and refill with fresh fuel. Then go from there....
It almost smells like it's running a bit rich. When you engage the mower deck, the popping stops. I have the mower deck off now since I'm using it to sweep leaves.Could be getting lean/hot. Could also be carbon buildup or possibly a burnt valve.
How long does it have to be running for it to happen?
My father said he did, since the fuel shut off solenoid was sticking and causing it to not start. I'm not sure how long ago that was though. I ordered a new gasket set for it, and that's my next plan, to tear apart the carb and see how clean it is.Have you cleaned the carburetor?
I will try that and see what it does.If you close the choke, partially or fully, does the popping go away?
At idle, take a can of WD40 or other flammable aerosol, and spray around the intake and carb, see if the idle changes. If the idle changes you have an air leak.
What kind of shape is the muffler in?
It does this popping constantly, no matter the engine speed. I do let it idle for a minute before shutting it off.My old tractor /sold would do that if after i run it at high idle and just stop it Try to let it run at low idle for 1 minute before you stop the engine I do that with all my tractors:unknown:
Maybe the carb is loose allowing air in through the intake track which would make the engine run very lean.I will try that and see what it does.
It only has 204 hours on it, I wouldn't think the muffler would be shot, but I'll inspect it.
With temps being much different between cylinders I'd check to make sure the cool cylinder is firing like it should.The carb rebuild kit came in the mail today, so I took the carb off, tore it down, thoroughly cleaned everything and put it back together with the new gaskets. Once it warmed up, it started popping again. The choke does stop most of it, so it's definitely a lean condition. Also, one of the cylinders is running cooler than the other. One is hot after running and the other is warm to where I can put my hand on the valve cover and not get burnt.
I'm not sure where to go next with this! I guess I'll pull the plugs and see how they look, since they only have 10 hours on them. Any other ideas?
Remove the bolt or nut and washer from top of flywheel and check the key. It may have sheared.