Abnormal noises

A healthy motorcycle has its own music, and that's exactly what makes abnormal noises so telling: the moment one note is off, something has changed. The hard part isn't hearing the noise, it's locating and describing it — because the same 'clunk' has a different origin depending on whether it comes from the bottom end, the drivetrain or a wheel.

Two questions help enormously in pinning down a noise. First: when does it appear? Only when cold, under acceleration, when you back off the throttle, when braking, or at a steady cruise? Second: where does it seem to come from? The front, the rear, the engine, the exhaust? A pinking that rises with load doesn't point to the same fault as a steady knock at idle or a squeal when braking.

Some noises are harmless and easy to deal with — a slightly dry chain, a pad that sings, an exhaust whose gasket has worked loose. Others are signals not to ignore, because they warn of mechanical wear that will only get worse. Knowing how to sort them out avoids both needless panic and dangerous neglect.

To locate a noise, a simple method helps a lot: try to reproduce the exact conditions where it appears, then change one thing at a time — pull and release the clutch to isolate the drivetrain, lift the throttle slightly, brake gently with the front then the rear separately. A noise that disappears with the clutch pulled in, that only shows up under braking, or that follows wheel speed rather than engine rpm immediately falls into a different family. Take the time to listen in a quiet spot, with the engine up to temperature: it's free and often decisive.

To narrow it down further, two mechanic's tricks help a lot. First: a long screwdriver (or a metal rod) held against a part with the other end to your ear transmits the sound and tells you whether it comes from the top end, the clutch or a casing — a poor man's stethoscope, but remarkably effective. Second: record the noise with your phone, while riding if needed. A recording is worth a thousand words at the shop counter and lets you compare how the noise changes over time. Also note whether it follows engine rpm or wheel speed: that's often decisive.

Spot the noise closest to what you hear below and start the guided diagnosis. It will help turn a vague impression of sound into a precise cause, step by step. And remember: faced with a deep mechanical noise you can't explain, the wise move is to have it confirmed by a pro before forcing it. Better to spend 30 € on a diagnosis than 300 € on damage.