The more you read, the more you learn ! It's helpful to tell us what type of motor your running. Grubee Skyhawk [ AKA China Girl ] is a popular frame mounted 2 stroke engine . Similar engines are marketed under various names. Rack Mounts are a different breed, the
engines are mechanicaly similar, but the drive system is unique . Friction drive is common to rack mounts .
A frame mounted engine is the most work, but offers the most motorcycle like look and feel. Shoot lots of pictures, good refrence for you, very helpful for posting, so members can reply.