There is an update for 04' to 08' 550 fan cooled engines. One is the carb needles and nozzles that need to be replaced to correct a mid-range lean condition for trail cruising. The second is an oil pump recirculation kit. One of the items is to remove the oil pump, discard the o-ring and install a gasket between the pump and block. **No where does it say to reshim the pump.....by installing the gasket you now have .028-.029" more play** Polaris recommends a .008-.016" end play for the pump in the service manual. You must add shims to obtain the proper end play or the oil pump shaft could be damaged. Polaris makes 3 different size shims: 3083671 (.006"), 3083672 (.012") and 3083673 (.024"). Add what you need to obtain the proper end play. Another problem......bring your caliper to measure the shims at your dealer.......Polaris has the wrong shims in the wrong bags. I opened 3 bags of the 3083672 (.012") shims to find 1 that was the proper size. All the other shims in the bags were .006". Packaged wrong.....beware.
maydaze
Joined
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3,106 Posts
Lol I have both the 550 and two 800s. Dad won't believe me when I say if you don't ride your 550 fast itll have problems.
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