are all the pullstart for .12 engine the same?? in other word, is pullstart universal fit in any engine as long as the engine size stay the same???

I currently have HPI .12SS engine. I think i'll get a new engine that's non-pullstart and put pullstart from my old engine to save some money.

You cant put a pull start on a non-pull start engine without modifying the engine. Just buy a new pull start engine.

hmm.... icic thank you thank you. another lesson learned about nitro car. hehe Thanx

Most pullstarts are not universal, in order to turn a a non pullstart engine into a pullstart engine you would need a backplate and a pullstart crank shaft. For first time nitro I wouldnt recommend trying to do this.