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2001 XL800 over revving engine

3954 Views 3 Replies 3 Participants Last post by  kitflyr
Help! I have a 2001 Yamaha XL800 three seater (120hp) with 120 hours. Engine runs well but from 8mph to 20mph, the engine will overrev without picking up speed. If it had a clutch, you would say it is slipping. Once I get up to 20 mph or so, it runs fine without slipping. I thought this PWC had a direct drive so how could it be slipping? Could be air in the impeller area. Someone said the wear ring might need replacing but the impeller seems to have little if any clearance with side of housing. Could it be a worn impeller? It has some a few nips. Or something else? Ideas?
Thank you
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Sounds like the seal in the pump shoe has blown out since you say the impeller has minimal clearance and no damage (make sure you check, clearance should be around 2-4thou). Remove the pump shoe (clean it) and sikaflex all areas that connect with the bottom of the ski, including under the pump ring. What is happening to your ski is cavitation. You will have to remove the scoop grate with 4 x 10mm bolts and pump shoe with 4 x 12mm bolts. Make sure when you re-assemble you but the long 10mm bolts to the front of the scoop grate.
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