Do i need to jet after i install a K&N air filter?

 

NVM, i think i do..

 

I just got a K&N also, Do you know which jets have to be changed? and too what?
I have and HMF slip on, i changed the Main jet to a 155 and it is running pretty good

 

hey rafiki do you run with the airbox lid? I got an hmf slip on and switched too a 135 from a 130 so i could keep the lid. I do alot of water and mud riding so i wanted my airbox lid. I think it runs good with a 135 jet. sounds to me like 155 would be big enough though. you could try running it without jetting and see then you wouldnt have to ask. i am no pro though so thats my $0.02 worth of this thread

 

What bike?

 

Z400

 

yeah it's a Z400.

When i went to the HMF Fourms they told me to Remove the snorkle and put in a 170 main jet. the stock was like a 130 or 135 so i thought that was a big jump but i did it anyway. The bike ran good till about 3/4 throttle and then i would sputter. So i split the difference ( 135 / 170 = 155 ) and it ran great. So now i just got a Outerwear w/ K&N filter and was wondering what jets have to be changed.