I started a thread about moving the engine from this machine into another machine but I've had a closer look at this and it's in quite good condition except the pull cord at the side of the machine doesn't work properly. It struggles to give a clean pull and just jerks along so that you can get about 6 to 12 inches before it jams up. I can see the plastic pinion gear inside and it all looks ok but you don't get a decent pull out of it. Sparks alright and compression feels good, any idea what needs to be replaced here.