i would like to replace the piston of my lawn mower do to wear and tear over the years.

zeke, April 2009

......but there probably won't be any point unless you can re-bore the cylinder as well. You will need a new (oversize) piston and ring set to match the re-bored cylinder. Forget it and fit a replacement engine - it will be cheaper anyway.

If you want to tackle it as an 'I can do it' exercise, check out the price of the parts - www.briggsbits.co.uk if Briggs & Stratton, phil_saunders(a)bigfoot.com if Tecumseh.

The best compromise would be a new short engine, and your existing head, flywheel, carb and cowling.

phil_saunders(a)bigfoot.com

Phil Saunders, April 2009

This means considerable dismantling of the engine, which needs to be on the bench. You have to remove the sump or lower cover to expose the crankshaft, and the cylinder head. With the big end bolts undone, the piston will come out through the top.

John, April 2009