My sons 2001 90cc started running real rough. No power and jerky no matter what the throttle position is. It also acts like it wants to jerk forward during warmup

I cleaned the bowl and Jets
Checked the plug and it looks fine

I dont have any ideas and would sure appreciate the help

Thanks

 

change the fuel filter? fresh fuel? check the intake boot for cracks?

could be a clutching problem I guess. you may need to inspect the cvt too.

 

i agree with raptorlegs...my initial thought was belt...

 

Changed gas and seems to have helped. How simpla a job is it to get to the belt?

 

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To get at the CVT belt, you have to remove the left side panels off your mini. If you've never done this before, you could possibly download a Polaris Scram-90 Service Manual from:

- Press Here -

Note: You may have to login the Polaris site if you haven't been there before.


If they don't have your Scram-90 Service manual, try the Pred-90 Service manual. To validate your steps, you can also cross reference against the Kolpin Service manual. The Kopin & Polaris are very simular in that area. The Kolpin Service manual in PDF format can be obtained from: - Press Here -

Note: Kolpin tranny info is in Section 4.5 / Page 25. They have great pictures in their Service manual.


Good luck!!!

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Had the same issue with a Sportsman 90.

Drain the tank completely
Buy a new fuel filter Make sure to put a loop in the fuel line when replacing on the carb.
Take a air line and blow out the fuel valve. I have had 4 or 5 of the 90s and every one has had junk in the gas tank. One had a power ranger and a army man in it.....

Hope you fix it.

Make sure the tank is clean........