07-20-2010, 10:21 AM
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Senior Member
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Join Date: May 2007
Location: Tarpon Capital Of The World
Posts: 2,122
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Re: Yamaha 250hp 2 Cycle - Bogging Down?
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. . The primer pump bulb is sucking shut again, so got to do some more investgating....
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That means there is a flow restriction UPSTREAM of the primer bulb, like a plugged filter, plugged screen on fuel pickup in the tank, plugged elbow, etc. Sounds like maybe the "ethanol-fuel-cleaning-out-tank disease! 
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Check the anti siphon valve on the tank. You can remove it and change it or just leave it off.
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Did you check this?
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