Engine 'ticking' Noise

[Eagle180]

Yamaha 2007 F115 (4Stroke) - 190 hours - Very well maintained with regards to maintenance schedule - still under warranty. Last two fishing trips I've noticed a 'ticking' noise. This ticking noise gets more rapid with higher RPMs and slower with lower RPMs. Took Cowling off at the boat dock and pressed in the free accelerator button to take out of gear in order to rev engine a bit and you can clearly hear the 'ticking' noise. Thought maybe it could be noise coming up from lower unit, that is why I took it out of gear in order to rev up engine a bit. The engine runs like a 'top' without any issues or bogging down, great fuel mileage, etc., etc. Could it be the valves need adjusting?

Anyway, boat is going to shop on April 17

 

[Capt Ken]

Re: Engine 'ticking' Noise

Funny you should mention this. This month's news from Yamaha mentioned tapping from the four strokes. Plunger on the fuel pump can cause a tapping if it's not staying in contact with the cam. Take a rubber tube and stick one end in you ear. Move the other end around the engine to locate the area of the tap.