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CBR 600F2 1991 - 1994 CBR 600F2

Needlesssssss

  #1  
Old 01-06-2019, 08:11 PM
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Default Needlesssssss

Hey it's me again lol
been trying my hand at tuning this 91 f2 for what feels like eternity. I've been shimming stock needles, removing shims, etc. I don't wanna buy an entire jet kit whereas I have bigger jets in it for the slip on. My only other guess would be the profile of the needle not working like I want.

Pulls great off idle and top end is smooth, problem is the in between, where it changes from pilot to main jet, gets a little fluttery or gurgling. Should I keep playing with shims or bite the bullet for jet kit.

TIA
 
  #2  
Old 01-09-2019, 02:09 PM
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I would go for a kit.. dynojet stage 1 is a great drop in kit thats works great..
 
  #3  
Old 01-10-2019, 09:00 AM
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Originally Posted by JacobG13 View Post
Hey it's me again lol
been trying my hand at tuning this 91 f2 for what feels like eternity. I've been shimming stock needles, removing shims, etc. I don't wanna buy an entire jet kit whereas I have bigger jets in it for the slip on. My only other guess would be the profile of the needle not working like I want.

Pulls great off idle and top end is smooth, problem is the in between, where it changes from pilot to main jet, gets a little fluttery or gurgling. Should I keep playing with shims or bite the bullet for jet kit.
TIA
For just a slipon, you shouldn't need bigger jets. That is probably your problem.
Bigger jets are probably making it to rich in the mid/upper range. Shimming the needles fix the upper range. But it's still too rich in the middle.
If you've got the stock jets, put them back in.
 
  #4  
Old 01-12-2019, 07:18 PM
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Well I've been chasing the issue the whole time I've had the bike. Tried the stock setup tried what feels like 1000 different variations. So I ordered a 6sigma jet kit. I'm gonna tear them all the way down an clean em good. Has anyone had this kit an had luck with it. Also I need y'all to talk me out of running open headers. I know it's bad but so tempting
 
  #5  
Old 01-14-2019, 07:16 AM
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Location: warren county N.J
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I never ran that jet kit.. i always used factory or dynojet.. if you want a chance of it running right keep the muffler on it..
 

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