Replaced K&N cones with UNI Pods

[ggRAT]

I replaced the K&N cones (RC-1920) with UNI Pods (UP4229AST).
WILL I NEED TO REJET?
Presently I've got 140 mains, 45 pilots (see signature below for more details.)

(I made the swap primarily to see if the side covers would fit better, i.e. more squarely. Result: I think the angled pods fit better, at least attaching the side covers takes less fiddling to center them.)

http://www.knfilters.com/search/univcone.aspx
http://www.unifilter.com/online catalog/universal.html

 

[SCBonneville]

I replaced the K&N cones (RC-1920) with UNI Pods (UP4229AST).
WILL I NEED TO REJET?

(I made the swap primarily to see if the side covers would fit better, i.e. more squarely. Result: I think the angled pods fit better, at least attaching the side covers takes less fiddling to center them.)

http://www.knfilters.com/search/univcone.aspx
http://www.unifilter.com/online catalog/universal.html

gg... I can't imagine that there would be a significant enough difference in flow between the two to require any rejetting... Just my 2 cents worth...

 

[mikenva]

with stock carbs you may or may not have to.with 39s or 42s you would need to.Wish I knew what to tell you.It is all a mater of if your carbs flow more then the K&N filters can feed them.If you do it should be lean at high rpms with the uni filters.If you do need to change it shouldnt be more then 1 size jet with stock carbs.On my 42s it was 2 sizes.

 

[wolfie]

I have Uni's installed, and with my current settings (see sig) I have some popping on decel. I think I'm going to have to increase my idle jet size. I'll try to do a dyno run sometime this year to get a better idea of where I am.

I'm curious to hear what others have experienced.

 

[BlueJ]

Wolfie- You didn't mention your airbox: intact? Popping on decel is a lot easier to fix by letting the pilot screws out a bit than by changing the pilot jets.