Motorcycle two-stroke engines feature a one-way valve positioned in the intake port. The valve is made up of a reed cage that holds the reed petals. The petals prevent the backward flow of crankcase air/fuel mixture out of the carburetor. Reed valves should be inspected on a routine basis. Over time, reed petals can fatigue and break loose causing severe engine damage.

The sprocket or toothed gear that drives the rear wheel(s) of a motorcycle or ATV. Sprockets are bolted to the hubs of motorcycle wheels and bolted to the axles of ATVs and are turned by the drive chain.

In motorcycling, rake refers to the angle of the forks from a true vertical position. Rake is measured counterclockwise from true vertical when viewed from the right side. A 0° rake would be considered vertical. Choppers are often referred to as being “raked-out” because their forks are fixed at a more forward angle. Some states have requirements as to the minimum and maximum rake a motorcycle is permitted to have for safe operation. Rake effects both the stability of the vehicle and steering “quickness”.

The 1997 Kawasaki ZX-6R has a rake of 24° as an example.