I mentioned the FS65AV in the first post. I cleaned it up today. It is a simmilar size as the other but has and angled spark plug hole. The compression is better, it measures 140 psi and turns very freely. It was covered in black gunk. I tried boiling it in kerosine with only limited success. Lots of wire brush action and finally blasting it did well.

I will run it before I get too crazy with further metal removal. I was thinking of removing the geneorous bell housing. If I put the sensor on the prop hub and removed the reinforcing belts there would not be much left. I would give back a little weight with the standoffs though. The standoffs would mate with the case at the rear belt that you can see on the outside of the case. The PTO shaft would be eliminated. I am a little skeptical of standoffs not giving enough torsional rigidity.

Any comments on this idea?