Cdi is acting up pick up a aftermarket where rhe spark curve is modified you will b amazed at the power difference
Could be a weak spark, since a weak spark will break down under load conditions. Pull the spark plug and make sure their is a fat purple spark. It could also be an air leak between the carb and the intake manifold causing a very weak gas to air ratio, running too lean.
SOURCE: I have an Polaris 550 Sportsman EFI ATV and it is sputtering and lacks power
fuel system clogged someplace or bad fuel in tank
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