Hi Grumpy, i seem to be going backwards somewhere. Spoke to friend who owns the saw and apparently 2 other people have had a play with it some time ago, but doesnt know what they have or have not done. Have done what you suggest, taken off all external parts and had a play with it that way. I am thinking it is more internal as last night and again this morning i gave it a quick run approx 1 min with a light rev then idle ,repeat, both times it started no problems, but both times i switched saw off and went to start it again the flywheel key had been broken, these times without the motor even missing a beat. Starting to think it might be possesed. Could it have something to do with the crank.