BMW Motorcycle Timing Belts & Chains

All About Timing Belts & Chains for BMW Motorcycles

The engine in your BMW motorcycle uses either a timing belt or a timing chain. These days, most bikes feature chains, with belts generally reserved for larger touring models. While they work in mostly the same way, they do have key differences.

Timing Chains Vs. Timing Belts

A timing chain is designed to drive the camshaft. A small roller chain connects the camshaft to your bike's crankshaft. How it works is simple. The crankshaft drives the chain, which then transmits power to the camshaft, which controls the opening and closing of the intake and exhaust valves -- and therefore, the engine cylinders. That synchronized movement is what allows the engine to run smoothly, without risk of the pistons banging into the valves and causing damage. The chain is lubricated by the motor oil running through the engine, and it's completely enclosed, to keep it shielded from water and dirt.

A timing belt, however, is a toothed belt, and it also connects the camshaft and crankshaft. Belts aren't as durable as chains, though, and belt material can become brittle or crack much more easily than that of a chain. Even if you don't see obvious signs of damage to a belt, the reinforcing cords within can weaken with time and excessive use. Either way, that can quickly lead to a more expensive repair job.

Signs a Timing Chain is Failing

The symptoms of a timing belt going bad, like those above, can be apparent. It's tougher, though, to diagnose timing chain trouble, since the chain's contained within the engine. Signs of a faulty one include:

• Weaker engine performance
• Strange noises coming from the engine
• The engine stalling or refusing to start
• Too much slack in the chain

Need help with this or any other engine part replacement? Feel free to contact a BMW dealership to schedule a service appointment.

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