This motor mount consist of an aluminum motor plate and two seat tube brackets. Weld the seat tube brackets to the seat tube on your bike frame and bolt the aluminum motor plate to the brackets. A 212 cc Predator or similar engine bolts directly to the motor plate in an upright position. The threaded holes in the motor mount accept 5/16 bolts. The seat tube brackets can work on 1" and 1-1/8" seat tubes with a little filing. There are two optional support pieces which are recommended for high horsepower applications over 15hp. Simple system for mounting engines vertically in bicycle frames.