B Class registration is a conditional form of registration that is available for motorcycles and ATVs that do not have a compliance plate but to which have been fitted head and tail lights, a working stop light and a muffler that limits noise level to no more than 94 dbA.

Mirrors, batteries and a horn are not required and choice of tyre is free.

This is a restricted level of registration and B Class motorcycles and quads can only be used on a public road whilst participating in an event arranged by Motorcycling WA or other organisation approved by the DPI.

Third-party personal insurance cover is provided by the State Government Insurance Commission while the motorcycles or quads are being used in competition.

Because of this limited insurance cover B Class Registration costs significantly less than A Class registration.