Does anyone know who makes the bottom end of this motor? Surely if Gas Gas can't provide a repair manual or parts list, there has got to be someplace to get the information. I also purchased the EC50 Boy enduro bike with the same engine and would like to get a pipe that will rev. It has the 70 kit in it and a 19mm carb and is choked for sure. Thanks.

have you checked the timing

we had a power problem because the timing was retarded

Yes, I actually had to retard it a touch because the engine would run backwards occasionally. I can't understand why GasGas tells me they will get me the information I request but they never follow through. Surely they didn't manufacture this motor for such a small market share...