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Old 01-06-2013, 14:16   #16
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Join Date: May 2013
Location: Malta
Boat: Beneteau Oceanis 40
Posts: 4
Re: Yamaha 9.9 outboard 2stroke running poorly

I saw someone also posted about read valves, this is another very possible problem for loss of power, but I would say only for 2 strokes that have worked very hard for a long time. When you remove the carb from the bottom of the engine you will see the fingers/reads. I have seen a read break off before, not common though. Will often be difficult to startand require more throttle to start. Will often die on idle though.
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