I have a 1978 Magnum MK II e50 with Treats 70cc kit, High comp head, CDI, Stuffy crank, and a 21mm oko carburetor. It does have spark. It hasn't ran in months. I've been adjusting the timing over and over and over, and i doubt thats the problem at this point. It is probably running rich, it has the 21mm carb. It spits over occasionally but not even a sign of starting even with starter fluid. I just got a bing 15mm carb but the intake made for it won't even fit on the magnum frame. So... new carb? keep working on timing? PLEASE HELP