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Discussion Starter #1
2008 660
What I know: belt is not wet. belt does not squeal. belt does not smoke. belt has less than 40 hrs


Last two trips, at end of day. she acts like minimum power is going to :|drive train. Not engine, it powers fine. Barely moves. Put her in 4 wheel drive and drive for a few. Take it out of 4 wheel and she is fine. Any ideas what to look for??


Muddn
 

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This is really weird.
What kind of engine oil do you use?
Do the brake handles go hard or soft?
Have you jacked it up and checked for play in the wheel bearings?
 

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Belt is OEM?
 

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Take belt cover off with the ATV jacked up and watch the clutch while you work the gas, make sure clutch is moving in and out.
 

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Discussion Starter #5
been looking

pulled belt and clutch, service manual gave procedure for checking centrifuge clutch in engine. It checked out. free spin on counter clockwise and locked on clockwise. do not know if that guarantees it is good, but it was in the service manual. Any other ideas befor I put it back together. everything else checks out.
 

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Discussion Starter #6
follow up

2008 660 1200miles. synthetic oil
wet clutch not functioning after bike has been ridden for a while. When tested wet clutch, it passed - per service manual. Will open engine, pull clutch and inspect.
 

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2008 660 1200miles. synthetic oil
wet clutch not functioning after bike has been ridden for a while. When tested wet clutch, it passed - per service manual. Will open engine, pull clutch and inspect.
That oil you put in. Does it say resource conserving or energy conserving on the back of the bottle in the little circle? If so change the oil to one that doesn't have that and see if it fixes your problem. You need to drain the oil anyway to get to the wet clutch.
 
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@Grizzcrazy might be onto something. Be totally positive that the oil, whether it's synthetic or not, is clearly rated that it is wet clutch compatible. Plenty of info and opinions on what's best, but the two most popular seem to be the Rototella T, wet clutch compatible, and the Amsoil synthetic. It might as simple as an oil change.
 

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pulled belt and clutch, service manual gave procedure for checking centrifuge clutch in engine. It checked out. free spin on counter clockwise and locked on clockwise. do not know if that guarantees it is good, but it was in the service manual. Any other ideas befor I put it back together. everything else checks out.
That test only verifies that the one way bearing is working properly. Slipping while riding is an indicator, tear down is the only way to check the WC.
Agree with the guys below change out the oil and filter 1-2 times with some short riding in between. See what happens. Don't waste $$ on sin oil. It's an older machine. Rotella T4 15-40 dino works great.

That oil you put in. Does it say resource conserving or energy conserving on the back of the bottle in the little circle? If so change the oil to one that doesn't have that and see if it fixes your problem. You need to drain the oil anyway to get to the wet clutch.
@Grizzcrazy might be onto something. Be totally positive that the oil, whether it's synthetic or not, is clearly rated that it is wet clutch compatible. Plenty of info and opinions on what's best, but the two most popular seem to be the Rototella T, wet clutch compatible, and the Amsoil synthetic. It might as simple as an oil change.
 
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