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Wrong oil mix and what damage it caused?

Hi
I ran my Husky chainsaw for two tanks on the wrong oil/petrol mix (I did 500:1 instead of 50:1 doh!)

I have put the corret mix through and it still runs but is diffcult to start and wont tickover without revs.

What damage have i caused and what can i do to fix it? Is it piston damage?

Guinness
February 2009

Husqvarna Garden Tools, Grass Trimmers Oil Mix Chainsaw

Take the cylinder barrel off the engine and do an inspection on piston and barrel, had a similar problem but the bore looked ok so changed the piston for one I got on ebay with two piston rings (std is one ring), I now get 140psi and the saw drops slowly when suspended of the rope starter. I expect the compression to improve with use - I get 170psi on my 345!

Steve
February 2009

Slightly scored the bore and piston resulting in a partial loss of compression. Won't get any better and will only get worse. If you repair in NOW you may get away with just a new piston and rings. Later on it's going to be a new barrel as well.

pleasant
February 2009