Repair guides and support for riding lawn tractors sold under the Murray brand name, currently owned by Briggs & Stratton.

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blowing out smoke and oil from muffler

lawnflite 906 with B S Engine correction Murray

I have a lawnflite ride on mower and when I started it up white smoke and oil came out of the briggs & stratton engine muffler it ran for a few moments then stopped. there does not appear to be any oil on the spark plug. any ideas anyone

Update (09/20/2016)

whitish/grey on start up for about 1 minute or so

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@jimmbo what Briggs and Stratton engine does your mower have? Could be a valve issue as well as rings, piston etc. Your spark plug face looks normal?


12.5 item no/ 289705


@jimmbo white/ grey smoke and now the starter does not turn the engine over? Can you turn the engine by hand? Worst case scenario could be a seized engine.


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Jimmy, check to ensure the crank case is not overfilled with oil, carburetor float/ fuel shut off solenoid may have stuck allowing gas into engine overfilling engine oil, if this is the case fix carb. and change oil/drain thoroughly and fill using fresh proper grade oil, before starting again. There are a lot more reasons for engine to smoke this is one of the common ones along with blown head gasket.

See links below for other causes and fixes.

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it seems to have done the trick, now the starter solinoid just goes click and its a new battery fitted


my mistake its not a lawnflite but a murray with a b/s engine


Jimmy recheck that battery is fully charged about 12.4 volts or better, make sure all wire and terminals are clean and tight. Solenoid could be faulty. Good luck.


Briggs & Stratton blows oil when breathe filter is removed!!!


Also if gas is leaking into cylinder, sometimes they won't crank well.. if at all. Pull spark plug and turn it over. 'Caution accumulated gas is likely to spray out spark plug hole.' Clean plug, reinstall. See if it turns over now.


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