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Discussion Starter #1
Running rough, sputtering & backfiring at low speeds & dies at idle.Runs great at higher speeds.
Changed spark plug & air filter. Cleaned the tank and strainer. checked the vent tube
 

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Check for trouble codes.

Consider wiring connection problems. The Polaris Service Manual states that 80% of electrical problems are caused by poor connections. No, intermittent or weak signals from various sensors don't provide proper info to the ECU so the engine doesn't run well.

Try running some Seafoam through the fuel system and see if it clears up. Dirty fuel injectors are a possibility.

Check spark arrestor for clogging. Owner's Manual has info.

Long shot possibility based upon limited information:
Cam timing jumped. The cam chain tensioner is hydraulic and some problems have been reported with them. When they have trouble the allow the cam chain to get loose, especially when first starting the engine and oil pressure is low. There is usally an accompanying noise of the chain rattling. During this time the chain can jump a tooth. This is NOT a common problem, just an outside possibility.

Problem could be any one of a number of things, not enough info for a reliable diagnosis.
 

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Discussion Starter #3
Check for trouble codes.

Consider wiring connection problems. The Polaris Service Manual states that 80% of electrical problems are caused by poor connections. No, intermittent or weak signals from various sensors don't provide proper info to the ECU so the engine doesn't run well.

Try running some Seafoam through the fuel system and see if it clears up. Dirty fuel injectors are a possibility.

Check spark arrestor for clogging. Owner's Manual has info.

Long shot possibility based upon limited information:
Cam timing jumped. The cam chain tensioner is hydraulic and some problems have been reported with them. When they have trouble the allow the cam chain to get loose, especially when first starting the engine and oil pressure is low. There is usally an accompanying noise of the chain rattling. During this time the chain can jump a tooth. This is NOT a common problem, just an outside possibility.

Problem could be any one of a number of things, not enough info for a reliable diagnosis.
Thanks for the information.
I think I will change the fuel filter and try the seafoam
 
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