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We recently bought a 1988 yamaha waverunner. We took it out the first day with new battery and spark plugs. it ran okay that day but clearly wasnt running at full power (speed) potential. Then we took it out again this weekend and was running about the same. but as the day went on it became slower and weaker.We checked the plugs and one was bad already but we changed it with no results. If we put my 70 pound son on it it runs about the same as it did before with an adult but with an adult it goes really slow. also when we it was running "better" anytime you jumped a wave or spun around it would loose power for a few seconds and ran best by only going straight. Im new to all this. Does anyone have an suggestions
 

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We recently bought a 1988 yamaha waverunner. We took it out the first day with new battery and spark plugs. it ran okay that day but clearly wasnt running at full power (speed) potential. Then we took it out again this weekend and was running about the same. but as the day went on it became slower and weaker.We checked the plugs and one was bad already but we changed it with no results. If we put my 70 pound son on it it runs about the same as it did before with an adult but with an adult it goes really slow. also when we it was running "better" anytime you jumped a wave or spun around it would loose power for a few seconds and ran best by only going straight. Im new to all this. Does anyone have an suggestions
I'm a neophyte to all this myself but I bought an 88 and a 92 last year and only had them on the lake a couple of times. These skis are REALLY slow. I had a buddy run alongside me with his boat and I think I was lucky to hit 30 MPH. Not sure what your definition of really slow is but I had a 95 Seadoo XP that was like a rocket compared to these things. I bought them at a fair price and just put a new battery in one so I will keep them and putt around the lake this summer...
 

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first make sure that your choke isn't stuck closed. Then like with the past 3 yamahas I owned, buy a $40 rebuild kit and a can of carb cleaner and clean the thing out and replace those diaphrams at minimum, it will make a immediate improvement to starting. Make sure all the passage ways in the carb are clear. I bet you have a bunch of white sediment, and it has affected the jets and vent. Then replace the fuel_water seperator AND a aftermarket inline fuel filter for additional assurance. Lastly, you are mixing your fuel and oil to the right ratio, right? (50:1)
 

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Same issues

Hi,
I have 2 of the same ski, 1 runs very well, pulls skierd and tubes no problem, the other seems to have the same issues as yours, let me know what you've found out, did you get the rebuld kit, carb cleanner, new diaphram and filters, did it make a difference?

thanks,

Jim
 
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