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Discussion Starter #1
While working on this stalling issue, I noticed at idle my engine has a slow wobble, you can watch it move 1/4” or so, slowly. Rev it and it turns to a vibration, not severe though. This normal?


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Motor mounts are bad.
 

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No, it shouldn't be doing much rocking or vibrating when at idle..... I'd check the motor mounts. Is it running fine otherwise??

What Year / Model machine? Help us, help you!
 

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Discussion Starter #4
It’s a 2004 Sportsman 700 efi. Other than the stalling issue it seems to run fine. It’s almost like a bent clutch and the belt is pulling on the engine but I don’t think that’s it. And at idle, it’s not like it’s shaking, more like swaying? Everything seems solid when I pull the engine around by hand. I haven’t had the belt cover off to look there yet.


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Your machine has four mounts so you may not necessarily be able to rock the engine by hand and tell they're bad. The machine is nearly 20yrs old I would say there is a high probability those mounts have seen better days.
 

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On the twins like yours, its usually the front mount that the rubber part of the mount detaches from the metal base of the mount. Common issue.
You have to use a pry bar right beside the mount to lift the engine while looking closely to see it.
 

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Discussion Starter #7
I’ll check tonight while I’m finishing up the wiring modifications. Thanks guys.


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All the mounts seem to be intact. I'll get back once I get the belt cover off.
Those engines aren't super smooth and do vibrate a some. Unless its excessive it may just be normal. One thing that will cause an increase in the vibration is a belt with a burnt spot in it. It'll get even more noticeable on acceleration under load if that's the issue.
 

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Discussion Starter #11
Turns out, the belt is smoked. Previous owner installed a Polaris belt +/-500 miles ago, but the wrong belt. Ordered a Gates Gforce belt to replace it.


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Turns out, the belt is smoked. Previous owner installed a Polaris belt +/-500 miles ago, but the wrong belt. Ordered a Gates Gforce belt to replace it.


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Thanks for the update. This helps us all learn potential failure modes. Glad it was a simple fix.
 

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While working on this stalling issue, I noticed at idle my engine has a slow wobble, you can watch it move 1/4” or so, slowly. Rev it and it turns to a vibration, not severe though. This normal?


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'
At idle the clutch is not in contact with the belt, the primary should be disengaged. Are you sure the is problem solved?
 

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Discussion Starter #15
Positive. Not in gear the light tension spins the secondary, the belt had thin spots, essentially making the belt longer and shorter while moving through the clutches. It’s all better now


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Discussion Starter #16
I’ll put up some pics next time I’m logged in not through Tapatalk


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