GP800 wont accelerate over 4000rpm

[dnxa]

I just got a 2000 gp 800y who has been sitting for two years. I drained all the old gas out and filled up with fresh gas 93 octane.Replace the fuel filter, put new spark plugs, new Yuasa battery. So I did a tune up and got it running great,idle good, rpms revup nice in the driveway, connected to a hose, but once it gets in the water, it refuses to open up . It gets up to 4000 rpm and falls flat on its face.When I take it out of water ski comes up in rpm and idles like a champ.
I checked the compression: 130 on both cylinders on full open throttle.

Any suggestions? Carbs, reeds, power valves?
Thanks in advance!!!!!!!!

 

[The Penguin]

Re: GP800 wont accelerate over 4000rpm

remove spark plug boots and make sure you have good contact between the plug boot and wire.

trim wire if needed (1/4" at a time) until you have good electrode to make contact.

 

[dnxa]

Re: GP800 wont accelerate over 4000rpm

I haven't had the time to try that yet. I really hope that is the problem, being such an easy fix.I'll get on it on Monday.
Thank you very much for your suggestion Penguin!