I've got a Hayter petrol lawnmower with a Briggs and Stratton 4 stroke engine.
In a moment of madness I turned it over to remove some blockages from the blade area.
There were some glugging and hissing noises!
Now it's very smokey. I've cleaned the air filter as per the instructions but it's still smokey.
Will it improve, have I killed it!?
Sounds like some sump oil has found its way into the cylinder. Should burn off, given time. Keep running it for short periods, and clean the plug after each run.
Yes. What you have probably done is allowed sump oil to ravel upwards to somewhere it dont normally go - possibly into the exhaust, and possibly into the cylinder if the exhaust valve was open.
check its still got enough oil in the sump (I assume a 4-stroke) and let it run till it burns the oil off. A plug clean is a good idea.
I discovered recently (after a neighbour's experience) that if you invert a lawnmower, the oil will flow back up the crankcase breather into the carb and will get ingested and soak the air filter. My neighbour's machine also had oil in the fuel.
Not sure how the last occurs but it has a diaphragm carb. I don't know if B&S carbs are similar but it would be worth checking the fuel for contamination after you've checked the air filter.
Tim
Chances are it will burn off with time. Chances are unlikely that you have done it any permanent mischief!
The air filter on mine is a block of sponge, and its possible to get that soaked with oil - you may need to wash though out in a bowl of water and detergent to get rid of some of the oil. Also check the dipstick to make sure it still has adequate oil.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.