Ok, I'm very new to the mini-bike world, except for the one I built 30+ years ago for myself. I'm trying to build one for my son, I bought a used frame without an engine. I had a good 2hp B&S engine off a McLane lawn mower. I thought wow, easy, I'll just take the engine off the LM and deposit it on the used frame and my 6 year old can run up and down the street. Problem is the throttle on the engine was one of those 'push - pull' types and I'm having trouble hooking up the cable from the rotating grip, it's almost like I have to change the carb or setup to accomidate the cable rather than the push / pull setup that the LM had. There is no return spring on the current setup and it does not look like one can be installed either. Do I need a different engine? Any ideas anyone? I can post pictures if needed.