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1999 gti power loss after 25 secs

Hi I am anew member also, and I have the same model and year pwc as you. It starts and runs perfectly out of water ,revs up and idles ok ,but put it in the drink it starts revs up jumps out of the hole and then drops to about half power ,the carb has been professionally rebuilt (it was clogged) tank baffle filters cleaned ,new plugs ,it,s still the same any advise appreciated
 

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power loss

thanks guy,s for the help
Iv,e done just about all the jobs mentioned with no luck, now it,s back in the shop for a carb rebuild ,will post you if it cures the problem thank,s again
 

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power loss after few seconds

Hi all you power loss sufferers
Had carb sorted ,they replaced the pop off valve problem solved !!
it seems the carb fills ,then when you hit the throttle it uses the bowl full of juice, but the main jet does not open and the power drops off .
new valve and away you go , stupid thing is that engine will rev right up off load but when under load (in water it needs more juice)
hope this will help others good luck and thanks.
 
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