Click/Tap on idle

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Click/Tap on idle

Hi,

I have a small commuter (ktm duke 125 2011) that has recently developed a click or tap on idle, it'll do it more and more frequently until it eventually dies. The revs will drop/skip when the click happens.

Here's a recording.

https://vocaroo.com/i/s0DoWnWo5SzP

It happens at roughly 4 seconds and then intermittently throughout. Shortly after the recording stops the last click cuts the engine out.

I've recently rebuilt the top end, new valve springs, new piston rings, sorted out a few coolant leak issues and stuck bolt exhaust manifold. It ran fine for a few weeks and now this annoying issue has cropped up.

It doesn't get worse with higher revs which makes me think (hope!) its not valve related. Electrical? failed exhaust gasket?