Developed a rattle or 'clackety-clack' which can roar in a 'whoah-whoah-whoah' style harmonic at about 3500-4000 RPM. Not at idle and not under full load.

Oil pressure remaims good, and it can be heard in the cab and from passing by. Extra noisy when against walls or through tunnels (no surprse there)

Do a lot of high reving track days and have recently had a full service including valve clearances.

Similar to the whirr when a push bike chain has a poorly adjusted gearing.

Anyone know the cause?



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