Motorcycle Glossary Dictionary Term - Thumper
Thumper: A single cylinder four-cycle motorcycle engine is sometimes called a Thumper because of its distinct "thump, thump, thump" sound.
Symbols, A - C:
(2-Second Rule => Custom Motorcycles)
D - H:
(Daytona => Hurt Report)
I - P:
(Inline 4 => Pushrods)
Q - S:
(Rake & Trail => Swing Arm)
T - Z:
(T-Bone => Zen)