When to rejet?

[JoeFab]

Hello All - I just put some HD Road King pipes on my 02 venture. Do I need to rejet? Some people I spoke to say yes, others say no. How do I know for sure? These things have absolutely no baffles and are loud as heck!!! TIA.

[yamahamer]

As long as you don't change the headers you don't need to rejet.

[Ponch]

Two things basically affect carb re-jetting. Air In & Air Out. If you didn't change the type of Air filtration or the headers, you're fine. Those headers are very restrictive. If the mufflers are all that was changed, you really haven't affected the discharge volume.

 

My

[waterbug]

What if you change to a K&N filter and RK pipes do you have to change them or just with a header? Thanks

[JoeFab]

Great! Thanks for replies.

 

[pegscraper]

K&N filters don't require a rejet no matter what else is done.