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sled runs and idles good,but when you get into the rpms the engine backs off like a det prob engine light flashes 6 times.no codes new det sensor, also new crank and pistons[?]
 

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Are all 12 service camapigns been done? (thats if its a 900) The 600s the carb boots are coming delaminated
If they are all done I guess if I had to take a stab at it I would say check fuel pressure if its a 900 that is
because with polaris's digital wrench that is one of the things it will not read or set off a trouble code
 
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