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2001 XL800 over revving engine

3946 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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Thank you GCwaverunner

GCwaverunner-you were right on the money. I had gotten similar info from a local PWC mechanic a week ago after I noticed a rubber piece hanging down below the ride plate. I took off the plate on the bottom along with the lower impeller housing. I used an instant gasket material called "The Right Stuff" from NAPA. The tube was pricy ($24) but it did the trick. Evidently, at low speeds no air gets down in the impeller area but when I got it up to about 8 mph, air starting entering from behind the impeller area through the missing rubber seal allowing the impeller to capitvate. The sealant worked.

Thank you. Kitflyr.
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