Question about Craftsman 21 Hp 42" Deck, Ys 4500 Lawn Tractor

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17.5 h.p. b/s craftsman tractor oil pushes into carb. smokes bad!

Runs about 15 min. before prob starts. smokes so bad you have to think its gonna blow-up! oil runs out of filter assy.

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Make sure it's not overfilled with oil.
if this is not the case, then you have excessive blowby, which is what blows past your rings when the air/fuel mixture ignites. there is only one explanation for this, faulty rings, and that's what it sounds like to me. the blowby forces the oil into the vent leading to the filter, and back into the cylinder, where it burns, creating blue smoke.

Posted on Apr 14, 2009

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Posted on Jan 02, 2017

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