Well I'm on build 2 now. I may not have made it clear but I have about 3 go kart projects. First build is the vertical shaft mower engine build. Thanks to this site, that project is well on its way.I'm just sick of the lame oil' Riggs and Stratton 5 horse engines. Anyway, I have 1 frame left with no power plant and I'm seriously thinking of a gy6 build. How hard/common is it to put on a frame it doesnt belong to? I know I can physically get it to fit. I'm just curious about the battery recharch wires and what not. They have fancy plugs and all that. Would I just be able to cut the plugs off and run them differently? And I'm a super newb on this whole cdi thing. Is it necessary? And what exactly does it do.