SO, i remember running this way back (1986) in Portugal, just ordered some from the UK, any one in North America running this OPS engines on 1/8 buggy?
https://www.mantuamodel.co.uk/Engine...Buggy_131.html

There is a distributor in the Us. for the Ops/ Radical engines. I rebuilt and modified a couple lately. They are a nice design and the quality looks good. One I worked on had way too much crank play but that was the only thing I didnt like.

Rex

Gotnitro also sells OPS engines...

http://www.shop.gotnitroonline.com/O...m1plqscsfapp02

So...I got the engine, but the crank has a different thread on it....all of my clutch nuts don't work....wtf, It looks like an M7 28....can't it be?

I would call Dave, from got nitro online I'm sure he will have an answer for u !