Due to the additional parts required for this operation, these engines are bulkier but produce smoother and more even power with superior emissions. Virtually every modern street motorcycle utilizes a ...

The best part? You won't even need to spend all that ... for example -- the V8 in the PGM V8 was a bonafide motorcycle engine ...

The difficulty of rolling a 16-cylinder engine into a motorcycle really boggles the ... And get this, those custom parts are being milled by hand, using time-tested techniques rather than modern ...

Narrator: This motorcycle is made from semitruck parts. It's called Tower Trike ... It's powered by a 320-horsepower semi engine and reaches up to 85 miles per hour. Jim: It won't keep up with ...