What engine design creates the 'potato-potato' sound of a Harley-Davidson?

The belt drive system instead of a chain

The use of a special type of fuel

A single shared crankpin for both pistons

What is the defining characteristic of BMW's signature 'boxer' engine?

The cylinders are arranged in a 'V' shape

It has three cylinders in a row

The two cylinders stick out horizontally to the sides

Riders race on public roads at extreme speeds

Only electric motorcycles are allowed to compete

The winner gets a lifetime supply of tea

It's the shortest motorcycle race in the world

To carry large amounts of groceries

To be as comfortable as possible for long trips

To make quick, high-speed trips between cafés

Footpegs that are placed very far forward

It ejected from the Batmobile (the Tumbler)

It prevents wheels from locking up during hard braking

It automatically cleans the brakes

It makes the motorcycle go faster

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