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I have a 2011 Polaris 550 that is backfiring but will not start. Looking for suggestions on what I need to troubleshoot. Already put in a new plug. Anyone know how do you check the timing and what valve adjustment should be?
 

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Welcome to the board!
 

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Same with my 2010 550 XP. Dealer said Bad Gas. Put a bottle of HEAT (red) in tank. Mine will start by feathering the throttle. After warm-up it runs and restarts fine. Will add SeaFoam to next tank.
 

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Polaris 550

Thanks for the info. Mine ended up being a problem with the intake valves. Too tight had to adjust. Finally got it running.
 
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