Generally I've had no problems either, but recently some guys in the club have had bearing failures on pretty new engines, including a Saito 100 and an OS 81a...expensive engines! There have been posts about others having failures too, so it makes me wonder if a better procedure might be needed. I like the idea of a short run with no nitro, all castor fuel because it would clean everything else out.

As for diesel fuel, I think it's the amyl nitrite (?...the ignition improver), isn't it? I think the kerosene, castor and ether are all fine.

Jim