CBR 600F2 1991 - 1994 CBR 600F2

bogging down

  #1  
Old 11-16-2014, 03:03 AM
Junior Member
Thread Starter
Join Date: Oct 2013
Posts: 12
Default bogging down

When running at high speed smy f2 seems to stop giving power, but gives plenty of power getting to 120 then nothing! Iv changed and cleaned carbs, she idles fine no flickering of the idle needle, shes got a straight thru yoshi end can, standard air filter am i missing anything? Thanks
 
  #2  
Old 11-16-2014, 05:24 AM
Mattson's Avatar
Retired Super Moderator, Tin Star Man & Hurricane Saloon Prospect, ROTM Feb 2015
Join Date: Sep 2011
Location: Vääksy, Finland
Posts: 2,382
Default

Even though you've cleaned the carbs I'm still leaning towards crap in the main jets. It can be tight in there and sometimes you can't even see it before running a strain from an electric wire back and forth through the jet. Possibly wouldn't hurt to put one notch bigger jets in with that yoshi.
 

Last edited by Mattson; 11-16-2014 at 05:27 AM.
  #3  
Old 11-16-2014, 05:28 AM
Junior Member
Thread Starter
Join Date: Oct 2013
Posts: 12
Default

New set of carbs were taken from a working bike, i changed the carbs as i thought the problem im getting was due to the carbs but i still have the same issue with these. What size jet would i need? What will i have to set if rejetting?
 
  #4  
Old 11-16-2014, 05:38 AM
Mattson's Avatar
Retired Super Moderator, Tin Star Man & Hurricane Saloon Prospect, ROTM Feb 2015
Join Date: Sep 2011
Location: Vääksy, Finland
Posts: 2,382
Default

https://cbrforum.com/forum/f2-tech-9...atabase-81653/

See if that helps. You first have to know what you got before you can upgrade. Do you remember do you have fixed clips in your jet needles or do you have several grooves you can put the clip? If so, raising the needles (putting the clips one groove lower) might be enough since the problem is only at full blast.
 
  #5  
Old 11-29-2014, 04:16 AM
Member
Join Date: Jan 2014
Posts: 58
Default

Beside the main jet possible being clogged, you may not be getting enough fuel into the bowls to sustain such speed. Make sure your filter is not clogged or restrictive and you've cleaned all lines leading to the bowls. The F2 is gravity feed so the fuel supply to the carbs must not be restricted in anyway.

Another possibility is your sprockets. Are you sure its bogging down and the previous owner didn't just put over sized rear sprockets with a smaller front? depending on the size of the sprockets the bike can tap out at 120 and it sometime feel like it's bogging down but in reality the gearing have reached the maximum speed possible

The ignition system can also produce such a feeling. I would check the coils pack resistance to make sure that they are within spec. A faulty coil pack can make the bike feel as if it have a fuel issue when in reality it's a spark problem.

Last possibility is how the bike is bogging down. Sometime at higher RPM's, excess vibration cause faulty safety switch to activate causing the bike to lose spark thus bogging down until the safety switch can go back to the proper state of function, after some vibration is reduced. You have to access how the bogging is taking place and begin checking the system from most logical to least logical possibility. Check the easy stuff first to not get into a situation where you've taken the bike apart and the fix end up being a simple one.

Sab
 

Last edited by Sabotage; 11-29-2014 at 04:26 AM.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Ickis
CBR 600F2
10
06-28-2012 10:10 AM
hooberjabber
CBR 600F
2
05-06-2012 11:08 PM
Slavo04
General Tech
0
07-17-2009 01:10 PM
2bikes
General Tech
0
05-11-2008 01:19 PM
Ski
F4i - Main Forum
3
07-20-2007 06:43 PM


Thread Tools
Search this Thread
Quick Reply: bogging down


Advertising
Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.