[Dayze]

I had a mower with a B&S motor on it; it would start doing the same thing.
could never figure out until I read the fuel petcock (on/off twist things) might be bad or mis-calibrated, and when in the 'off' position, could be slowly leaking fuel into the oil reservoir, thus eventually becoming 'overfilled' a bit, and would smoke on start up.

before I read up about that thing, it would alwyas - about mid-season each year- start smoking at start up etc. each winter I would change the oil etc, and the following spring, woudl be fine. then by July...smoke.

I switched out the petcock thing; voila. never smoked again.

take a whiff of the dip stick; if it smells like fuel, it might be a similar problem. that's what I did; took a whiff and yp...smelled a little like fuel. switch the petcokc thing out, changed the oil. problem solved.


my honda does it now too a bit. but I found it's just eaiser to change the oil when it starts doing it. since it's quick and easy on the push. but the 21hp motor...assuming it's a rider. might be easier to look into the petcock thing.
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