Engine keeps running on, or dieseling - Seafoam fix?

[ShawnAgne]

I made a siphon out of a ball inflation needle and hose that I attach through the small screw of the manifold. Have used it on the original Cub motor and the 300 and it does blow out a lot of black stuff. I think I may do it again on the 300 as I pulled the 386 plugs after doing the conversion to 12V and they were heavily coated in black crud.

[ajhbike]

I had trouble with rough running on my cub. I put a tablespoon in each spark plug hole, cleaned and gapped the plugs and reinstalled them. Then I colored the dosage and put some inn the oil. I probably ran it 5 hours total in the next 2 weeks and changed the oil. It helped smooth things out allot.
I also put it in the gas every so often of all 3 tractors, chain saws, lawn mower, snow blowers and after the smoke clears, things seem to run better