Thanks a lot for that template. I printed it, laminated it, and cut it out. Put it up to the planned bmx frame and the engine will be too big
I went ahead and ordered a bike engine kit from bike berry.
Flying Horse Silver Angle Fire 66/80cc Bicycle Engine Kit EPA BikeBerry.com
I'll see if I can make it work on the bmx once it gets here. If not, I have a pertty blue cruiser with ape bars that a shop mate at work wants to sell me.