Hijack away. My first Sporty is/was a .45 with the bushingless case and I think that with all the bearing surface of that huge diametr crankshaft it won't be a problem as long as I use goood all castor fuel. I am completely sold on Sig 20% all castor for everything now. I just measured the crankshafts of my beloved K&B .28 and a nice OS .25 FP. The K&B has a much larger bearing surface area so the bushing issue may be moot. I am getting .472" X 1.42" for the Sporty and only .432" X 1.12 for the OS. That is a substantial amount of bearing surfce. By the way, my Sporties ain't scared of lots of nitro.