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Yamaha 90hp 2s - Ticking/knocking noise.

Bv99

New member
Hello people!

I have a Yamaha 90hp 2s with a very obvious ticking or knocking sound when in idle, although it doesn't appear to make the noise when in gear!

It seems like quite a distinctive noise, I've tried looking up the issue, some have suggested piston slap, others spark issues, dirty or improperly fueled carbs etc, but I've not quite managed to find a sound to match the issue from videos of others engines.

Here's a video of the engine at idle,

The outboard is also ex RNLI for anyone familiar with the organisation, and it does have an inversion kit on it designed to allow the engine to continue running after a capsize, no idea if this would contribute to the issue?

Thanks in advance for any advice 🙂
 
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