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Why’s my Suzuki Bandit knocking?

Q. When my Suzuki Bandit 600 is cold or just warming up I can hear a knocking noise like a “tap, tap, tap, tap, tap, tap”. When the bike warms up it stops. Is this ok or something I should worry about?

I can’t tell from the service history invoices whether the valve clearances/cam chain tensioner etc were checked. The noise disappears when the bike is fully warmed up and it only seems to happen on tickover/low revs.

The bike is fitted with a 33BHP restrictor kit. It is rev-dependant.
Morpheusking, MCN forums

A. That tapping noise could be a lot of things. Without being able to hear it we would say it’s probably just a bit of backlash in the camchain at idle. It could be worth lifting the idle speed very slightly from 1000 to 1200rpm to see if this helps.

But it could also be a tappet, a loose spark plug ticking, or even one of the 33bhp restrictor plates rattling at low revs.

To locate the source of the noise use a long screwdriver as a stethoscope, the handle makes a good ear piece. Move the tip around the engine until you hear the noise at its loudest.

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