Originally posted by rod_b
Well, I just got my MT-12 I bought off a guy used. He said it's only been broken in but I'd have to believe that it's been through a lot more or abused. While there is a fair amount of compression, I took the engine apart and can push the piston past the top of the sleeve. Am I wrong or has this engine had it? Also, the front bearing feels gritty. I was told this engine was in an XXX-NT. Seems like maybe it got some dirt in it. Should I ask for my money back?
Doesn't sound promising. The "Motorman" test is as follows:
1. Put a splash of fuel (small amount) into the exhaust port with the glow plug in place.
2. Rotate the flywheel while listening to the exhuast port.
3. As the piston closes off the exhaust port you should hear some hissing.
4. As you rotate the piston to the top of the stroke stop and hold it. It should hold compression (be totally silent no hissing) for at least 20-30 seconds.