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The oil pumps on most Polaris sleds are Mikuni and are usually very dependable. I don't think anyone makes an after-market pump, because there is not much demand...
Using pre-mix is always an option, but to do so you either need to run a small oil tank to the pump and have the pump discharge back to the tank (closed loop) or remove the pump completely and block the hole vacated by the pump. If you leave the pump and remove the oil tank, there is a chance that the pump can seize.
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2007 RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008 
04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/accidents.php
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