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Polaris 2003 MSX 140 - Sputters at Mid-Throttle - idles fine

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I have a 2003 Polaris MSX 140, has only 45hrs in it. had it professionaly winterized last november. took them out on the water today, and after about 1 hour of riding the polaris while at full throttle, became sluggish... speed dropped to about 30mph. i thought i might have sucked something up, i checked and there were no obstructions... removed the plugs when i got home they look fine, i looked but cant find a fuel filter...

any suggestions would be appreciated!

Thanks
Michael:dunno:
 
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