I don't post a whole lot but I read a lot on this tread. So here is something I found interesting let me know what you think. I picked up an (GASP)! H.P.I. MT2 real cheap last month. The rear back plate of the engine was drilled full of holes to accommodate an power drill starter that was the wrong kind. Well I had an extra pull starter and backplate off of a NT.16 I put it on the H.P.I. .18ss engine it fits perfectly not even off 1 mm. so I started to look at other things . The screws look similar, the anodizing color of the chassis look alike. Some of the plastic parts look like they could be made together to. I wonder if the H.P.I. and CEN fun factors are made by some subcontractor who makes parts for both.