Thumper (motorcycle)

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A 250cc BMW R27 "thumper"
A 250cc BMW R27 "thumper"

A thumper is a motorcycle powered by a large capacity single-cylinder 4-stroke engine, so called due to the thump-thump-thump sound the engine makes.

Thumpers have good low-end power and are most often dirt-oriented bikes or dual sport motorcycles.

Some examples include the BMW F650, Kawasaki KLR, and Suzuki DR.

Harley Davidson converted the V-twin of its discontinued Sportster 1000 engine to make the 492cc (30.02 cubic inches) air-cooled power plant for its belt-driven Buell Blast model.

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