Quote:
Originally Posted by Cubcadet_107
I encountered a similar issue on a Simplicity Conquest with a Briggs 18hp engine. In some way, the issue was being caused by a bad air filter. It ran fine without the filter, and runs fine with the new one. However the carb also has some gunk in it still, the throttle wanders until I put it under load (engage the deck). Are you certain it didn't throw one rod? Was there a "clunk" sound when it started running rough? Easiest way to check is by turning the engine over by hand and looking into the cylinder through spark plug hole. I would say fuel issues more than anything, but I can't be certain. Your engine might have a completely different issue than mine had.
|
In addition to new plugs, I gave a full oil change and new air filter. Also new fuel filter. No change at all unfortunately.
How loud of a clunk would it have been? But I don't think so, at least nothing that I could hear over the sound of the engine/mower (and wearing ear protection). It was sudden though, not a gradual decline.
I'll try turning it by hand and see if there's anything obvious.
I'm leaning toward fuel as well, but I'm not familiar enough with symptoms of lost compression or other internal damage to rule any of those out.