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my 1991 yamaha superjet just wants to keep jumping out of the water over half throttle does anyone know what could be causing this and how to fix it
 

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Not being a smart ass.Is this your first standup to ride? if so you may be standing to far back.My kawi 550 used to do the same when i didnt know any better. They also make for kawi(not sure for yamaha) but and adapter to bolt on the pump housing to direct water at a downward angle to keep the ski from porposing.Someone could of put one on yours and installed it upside down
 
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