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 ...

Motorcycle engines are designed to operate within a temperature range that allows for maximum efficiency between all of the moving parts. At the right temperature all the clearances within the ...

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 ...