My neighbor gave me a 1995 nitro stampede the other day with a TRX.15 ez start engine,I have a 3.3revo so I had the ez start.So, it took ten minutes to get it running and ran it, it was all stock and stripped the spur gear,thought the old plastic might have been the problem. Replaced that and ran it for 5 minutes and again it stripped my spur gear .That was brand new so it couldnt be the plastic. I dont know what to do with it, the first two times I ran it I stripped a spur gear. Got any suggestions? Thanks.