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On mine when it was stock it had a big plastic box on the side with a filter in it. I removed the whole box and just stuck a uni filter on the carb but my stock main jet was a 107 even after I put the uni filter on I could not put a bigger jet than a 109 or it was bogging down past half throttle. It wasn't until I modified the exhaust that I could run a 115. If that stock air box is on there even if you have a better exhaust 120 is still probably to big. It also depends on you elevation. I am pretty low so I don't need as much fuel as if I were in the mountains.
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