At high altitude polaris runs rough and lopes
well not knowing the model or year of mfg , ill assume its one with fuel injection , the mAP Sensor is the device that controls this function , they do sometimes get clogged up and require a good cleanout with some Map sensor spray (don't use brakeclean!!!) unless you want to buy a new one (sensor that is not atv) but even that's only gonna get you too about ten thousand feet , any higher than that your gonna need custom software to get it to run ok
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