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Discussion Starter · #1 ·
i have a 1981 gps 503 rotax changed old gas out mixed fuel and oil ok changed out plug caps still fouls after a short while of running time(1 plug only). any help would be appreciated
 

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I'm not familiar with your sled....but..Your problem probably lies in the needles, seats and jets in the carb.......clean them out or replace them...as they're prety inexpensive.
 

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Discussion Starter · #3 ·
im sorry its a 1981 motoski gps and thanks for the advice.its only got 2900 original miles and no rips or tears in seat original skis new brakes new track so i guess ill do the work since it was a cheap enough buy
 
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