chainsaw mix

Mylargo

Hi
I have accidentally mixed four-stroke oil with petrol for my chainsaw. I only realised after tracing back my steps when the chainsaw stopped working. Any advice on this or have I destroyed the chainsaw.
Thank you

99nsr125

Well sure it'll can only somewhere on a scale between two possibilities.

Either the oil didn't lubricate and you've damaged the piston and bore or it the oil didn't burn at all and the saw died because of bad fuel.

I'm sure you're already trying a few of these but just in case.

Mix up all new fuel, discard the old fuel and empty the remains of the wrong fuel out of the say as much as possible.

Remove the spark plug and clean it off with a drop of petrol.

Still with the plug removed fill the chamber with oil, the normal engine oil will be okay for this, two stroke would be better but regular engine oil will do. Leave to soak for a few hours. After a few hours of the oil soaking in the chamber, still with the plug removed, turn the engine nice and slowly (oil will come out the plug hole and exhaust, you've been warned) if the engine feels free enough to normal keep slowly turning and try to get up to normal starting speed. Really you should take off the exhaust to allow the excess oil out.

If the engine won't turn relatively freely after soaking with oil don't force it and you're best off stripping the engine to inspect for damage.

If you get this far flush out the chamber with the fresh petrol and two stroke mix and turn the engine over a couple of times to work the fresh mix through, replace the plug, fill the fuel tank with the newly mixed fuel and try to start as normal.

It'll be hard to start and you'll get clouds of white smoke as the excess oil it burnt off in the exhaust.

If it does start it's very likely to run rough, a little bit is ok but alot of vibration and rough running means your basically screwed and a rebuild is needed.

Mylargo

99nsr125
Thanks very much for your time and advice I will try what you suggest.