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Hi there I am new too this forum, but I here it is the best. I have a Polaris sportsman 500 running very lean. It is completely stock. I have upped the main jet to a 167.5, moved the clip down one on the needle, rebuilt the fuel pump, changed the fuel filter and the spark plug. From idle to 3/4 throttle is good, it is full throttle that it lags. The spark plug is bright white. Any help would be awesome. Thanks in advance!!!
The air filter is a brand new stock one with a pre wrap. I am only about 500' elevation. I just cant figure out why I need to go even bigger on the main. Stock 155 I went to 167.5 on a bone stock bike. I appreciate the help guys. Hopefully we can figure this out. Tonight I will bump the main jet 2 more sizes and see what happens.
Clean the carb thoroghly while you have it apart , put the needle on the middle notch. I just thought of what might be the problem, start it up and spray carb cleaner around the intake boot, it may be cracked and sucking air, that would make it real lean, check that before you do any more jetting.
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