I bought a K&N air filter a while back, but still been running the stock foam filter. Would the K&N make a big enough difference in air flow to have to rejet? or will it be alright to run it with the stock jetting? Its a 2004 rancher 350 and is pretty much stock.

 

You should not have to rejet. Probably just an air/fuel mixture adjustment.

 

you should not have to rejet for just a filter. If you did a pipe too then yes you would have to rejet.

 

thanks for the advice