Yamaha 9.9 4stroke 2006

by Darren
(QLD Australia )

I have recently replaced needle valve & mix screw & motor ran well for a few hours, & now runs good with the cowling off, but as soon as the cowling goes back on it starts to shudder & finally stalls after 30 secs. Yes this sounds like an air intake issue, I can confirm that the breather holes in cowling are clear, the air intake is clear with a clean mesh. In frustration I even drilled a 25mm hole in the top of the cowling, oh & have tried the cowling from the other motor

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