The only real problem I can see is that the engine more than likely has a 1" output shaft. Centrifugal clutches are considerably more expensive than a 3/4". But theer is a way to get around buying the $100 clutch. Put a 3/4 bore clutch on a jackshaft. They will fit with some frame modification in a DB and, of course, lots of vintage frames. I traded a similar engine to a friend for a 250 Montessa engine. He put the Briggs in a modified DB. A lot more powerful that you would expect. I'm sorry I traded...that DB is that cool and fast. At last count two people have looped it.