im going to replace my stock airfilter with a K&N. my question is will i NEED to rejet to get better performance? i have no idea on how to change jets. do i have to take the carb off to get to them or can i just take off the seat and some plastic? what do i buy if i do need to rejet? do i just order a jetkit or buy a few main jets? some people have told me i dont need to rejet and some people have told me i do. will i get better performance w/ the K&N even if i dont rejet? will i be able to tell a increse in power? i am getting a pipe also afterwards. i really need help with this before i go and buy the stuff. thanks in advance

 

I dont know how to rejet...........but yes you will notice a increase in power with a pipe and silencer....I dont THINK you have to rejet with a diff air-filter,but you WILL if u get a new pipe and silencer.
I hear the YOSHIMURA pipes are real good and the t-4 is even better from pro-circuit.




Icav

 

when I just put my K&N filter on I didn't have to rejet...even when I put on my DMC exhaust I didn't have to rejet...and it runs great

 

The Rancher has pretty restrictive airflow. The snorkle runs up under the fuel tank, and the opening isn't that big. The K&N probably won't effect your airflow to much, because the size of the snorkle is pretty much the limiting factor in airflow. Personally, I run the K&N on my utilities for convenience of cleaning. Any increased airflow and performance is an added bonus. You can vent your airbox lid, but this is risky if you ride in the wet, because you may suck water into your intake. I don't vent my airbox on the utilities for this reason. Plus, the filter stays much cleaner in dusty conditions.

Be very carefull though!! Anytime you increase airflow your bike will run leaner, and this is a dangerous condition for you motor. Buy a service manual. It will have a section on jetting the carburator. There are jet kits available from Dynojet and K&N. Rocky Mountain carries these for the Rancher as I recall. JETTING IS MORE ART THAN SCIENCE, and takes a lot of experience!! If you aren't up to it have an experienced mechanic do the job.