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Old 29 August 2010, 02:11   #1
Country: Other
Town: Cebu Philippines
Boat name: JP
Make: LianYa
Length: 5m +
Engine: Yamaha
Join Date: Jul 2010
Posts: 45
merc 90 2stroke carb fuel

My problem...the first five minutes of running at 4000rpms everything is ok. then suddenly it starts to slow down inconsistently, so I put it to ilde, and give it a go and its ok again for short period of time, what chould be the probem??

I suspect cloged main jets...would that be possible?

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Old 29 August 2010, 02:30   #2
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,552
Is the primer bulb hard when it does it?

I suspect either an air leak in the fuel system or a dodgy (probably pinholed) diaphragm in the fuel pump.

It wouldn't reach 4000 rpm under load with clogged up mainjets.
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