My motor is stock and I was thinking of replacing the stock air filter with a K&N and was wondering if I have to get the carb jetted. Also do you have to jet it for a slip on muffler or just when you install a full-exhaust?
Just changing the filter will not make enough of a difference to need a rejet. If you swap the muffler for a performance one, I would do a full exahust system as everyone else has said. With that, you will need a rejet kit.
If you only have a stock motor, most of the power comes from the slip-on part of the exhaust. It's kinda uselesss to have a full. You can save money that way too. But hey it makes a lil more power. Do you ride in dusty/dirty conditions? If so then I would get a UNI air filter. They don't let in as much dirt as the K&N's do. Or you could just put a cover over the K&N, but it costs like $20 more over the UNI.
I agree with the others I wouldn't worry about the jet kit if you are only replacing the filter. If you pput the exhaust on then yes definitely jet it. Using just a slip on muffler with the stock exhaust is good my friend has yashamira muffler,k&n and a jet kit it run really well
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