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Rebuilt Fh680V approximately 300 hours ago. Running great for the last 250. Started to run a little rough at idle (sometimes stall) and now rough at wot. Went to a hotter plug NGK BPR2ES. Didn't work. Plugs are covered with soot after 4 hours of running. New carb, fuel pump, stator, coils...

18.5 HP Intek model 31P677-0132-B1. Engine blew up and the sump was damaged (unusable). I had used parts to put it back together other than the sump with the oil filter. I installed a sump without the oil filter that I had. The connecting rod has a hole in the cap and the crankshaft has 3...