Ok I am new to this whole jetting thing so forgive me if I ask stupid questions. I have a 2003 Honda Rancher, I ordered a Supertrapp Ids2 exhaust and a K&N air filter. I was wondering what size of main jet i will have to buy and will i have to adjust anything else inside the carb?

 

Check with your local Honda dealer. They will be able to tell you. It is hard to say wich jet would benifit you without knowing what altitude you ride at, but I am willing to bet that your stock jet is a 148 and you should put in a 152