The only reason I didnt want to use nitro is that, since it is an oxidiser, I fear for rusted bearings if any is left behind in the engine.

Plain castor only to protect the engine as much as possible during its initial run-in when the piston and liner ar in the mating stage.

The baffle has be baffled however, it feels rough to turn even after putting in the oil. Atleast it feels rougher than my other engines but nothing a standard servo cant take care of. With my luck with engines this year, I am worried about everything

Ameyam