Originally Posted by OkiThumper
AFAIK, I have no engines like that. They all have at least bronze bearing inserts.
Yes, that is what I have gathered.
However did find one oddity. I mounted in the test stand today a Gilbert .074 Thunderhead engine I bought some 5 or 6 years ago from Tower Hobbies. It was in one of their special sales flyers. for under $15. Crankshaft has considerable wobble, quite noticeable. I'll find out more when I run it tomorrow.
Crank rock is a character trait of these it seems, at least on the ones I have seen.
If you run any Cox or other similar .049s (which is what this thread was about to start) these are all shaft in case bearing engines with no bushing and they need the castor, otherwise you will have crank rock out the wazoo real soon...