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Lawn boy Supreme

15 years ago

I have a Lawn Boy Supreme, 2 stroke, that is very slow to warm up when I first start it. It runs really slow at first then speeds up after running for awhile but it takes a long time for it to run fast enough to cut grass. I've changed the fuel line, cleaned the air filter and tried adjusting the carburetor but that didn't help much. I wonder what I should try next. It seems to have plenty of spark.

Model # S19ZPN

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Comments (2)

orangedotfever
15 years ago
Check the exhaust ports and muffler for carbon deposits.
1saxman
15 years ago
Exactly what odf said. This means taking off the whole muffler assembly and cleaning out the carbon plus cleaning the cylinder exhaust ports. You have to be very careful there not to scratch the piston. This is supposed to be annual maintenance. You can reduce carbon formation by the use of certain oils/additives and making sure it is not running rich. Just adding Marvel Mystery Oil to your 2-cycle mix will go a long way in keeping the entire fuel system and engine clean.
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