cowl air inlet on mercury 9.9.

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cyclops222

Commander
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Mar 21, 2024
Messages
2,786
It runs better.
By chance is there any SOUND INSULATION glued to inside of the cover in front of the air inlet to the engine ? it can come loose at high airflow rates. And block some of airflow at WOT. Then swing back to cover surface as engine speed drops.
 
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billhig

Cadet
Joined
Apr 27, 2025
Messages
23
airshot said:
Remove that piece on the handle area on the inside and see if that helps.
Click to expand...
I tried that and it had little or no effect. it should be getting plenty or air now. I also pulled the exhaust plate and that gasket is in perfect shape. no exhaust leaks there.
 
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airshot

Vice Admiral
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Jul 22, 2008
Messages
5,803
OK....gotta ask, are you sure there are no wires being pinched ? No linkage being bound up when the cowl slips on ? This should not be so complicated ..
 
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billhig

Cadet
Joined
Apr 27, 2025
Messages
23
airshot said:
OK....gotta ask, are you sure there are no wires being pinched ? No linkage being bound up when the cowl slips on ? This should not be so complicated ..
Click to expand...
I know. There is nothing touching the cowl at all. I think it has to be air/exhaust related.
 
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