Someone please tell me has anyone had a problem with spinning bearings in the k series motors ?

 

Yes, it is heard of. Normally from improper build ups or heavy abuse or neglate. Depending on your plans, the K Series is still a nice build. With the people that we have build up our engines, we don't have consern with running a K Series drag car and putting a lot of abuse to it.

 

usally on the k20a2......