I just tore mine down and looked at the crank pin and rod bushings. All look good. Without bearings it takes quite a bit of oil to keep the bushings properly lubed. I had read that 20:1 was enough for bushings but wasn't sure. Looks like it's off to the LHS to get a new ST51 to run on Gas/Oil in the Sportster. The glow carb is more sensitive than on glow fuel but it is usable. ST's have very fine threads on the needle anyway.