SeaFoam. As recommended here and by the mechanic at the local lawnmower repair shop. Had to let it soak 3 separate times then use wooden dowel till it quit working and small screwdriver. with the piston blocking the exhaust ports, spayed sea foam till it filled all holes, it stayed right there and didnt seep out like i thought it would. then I worked the holes with wooden dowel. When the wooden dowel quit working I grabbed small screw driver and just kept soaking and "scratching" at it till it was gone being careful of the piston. Blew all the holes out then moved the piston and blew thru the spark plug hole clearing out any debris that may have gotten into the cylinder.Wow, that's clean! What's your secret for getting it that spotless?
And if you were talking about the whole motor, I use alot of Simple Green. Scraped off the thick heavy crap, grass, grease, spiders, etc. Then soaked with simple green. Hosed it off. Resoaked, scrubbed with toothbrush, hosed it off. Tempted to use pressure washer but afraid may get water into motor, even tho I plugged up intake and exhaust and spark plug hole.Wow, that's clean! What's your secret for getting it that spotless?
Yea it does. Really does. Especially since I had no clue how to do any of this till the end of July whe my nephew taught me.A job well done! You should be proud of the results.
Isn't that the sweetest sound, a LawnBoy roaring to life after you've gone thru the engine and cleaned it up?