Primary Drive Kits

About Primary Drive Kits

A primary drive kit gathers the parts for the link between the engine and the transmission. This is a very small category, and its two listings are different parts: a compensator ramp for M8 models from 2017 to 2024, and a 3 inch Shorty belt drive kit.

The compensator ramp is part of the compensator assembly, which smooths out torque pulses between the engine and the primary drive, and it is listed for the M8 years shown. A belt drive kit replaces the primary chain drive with a belt and pulleys, and it must match your model and year.

Brands here are S&S Cycle and Belt Drives Ltd. Pick your machine in the Ride Finder at the top of the page. More primary drive parts are in Primary Drive Belts & Chains, Primary Drive Housings & Covers and Drive Belt Pulleys & Tensioners, all part of Final & Primary Drive Parts & Kits.

FAQs on primary drive kits

What is in a primary belt drive kit?

Contents depend on the kit, so read the listing. A belt drive kit usually includes the belt and the pulleys it runs on, and may add hardware. Check what the maker says you still need, such as gaskets or covers.

What does a compensator ramp do?

A compensator ramp is part of the compensator assembly in the primary drive. It helps smooth out torque pulses from the engine so the drivetrain runs more evenly. The listing here is for M8 models from 2017 to 2024.

Are primary drive kits specific to a model?

Yes. Kits are listed for particular models and year ranges, because the engine and transmission shafts, covers and spacing differ between them. Check the listing against your model and year.

Do I need new primary fluid after fitting a kit?

It depends on the kit. A belt drive may run dry, while a chain drive uses oil. The kit instructions and your service manual say what fluid goes in the primary housing, if any.