F4i - Main Forum Main F4i discussion board

'01 F4i bogging down - TFI installed

  #1  
Old 08-03-2010, 02:49 PM
Junior Member
Thread Starter
Join Date: Jun 2008
Location: Idaho
Posts: 10
Default '01 F4i bogging down - TFI installed

Hey all,

I have a 2001 CBR F4i with a TFI module installed. I purchased the bike used and have owned it for almost 3 years (TFI was installed by previous owner). I have not had any problems with the bike until about 2-3 weeks ago. The bike bogs down / hesitates a lot when starting out from 0mph and continues through about the 4-7k rpm range. Is the bogging down a sign of too much fuel into the cylinders? I noticed that with the TFI module, if I adjust it to add more fuel the symptoms seem to get worse and when I scale it back the symptoms aren't as bad. It seems worse after the bike is fully warmed up past 200F. Also, the FI light will randomly come on when it's bogging really bad and occasionally the bike will stall out. Am I looking at a problem more extensive than a TFI box or should I just scale it down until I am happy with performance? It has a few other mods to the bike (straight piped, bigger rear sprocket). I checked the fuel tank for rust (none), replaced spark plugs, and cleaned k&n air filter. Any other thoughts on what the problem could be?

I never had a problem with the TFI before and now it started acting up.

I'm lost as where to go from here. I attached a pic of a spark plug I R&R
 
Attached Thumbnails '01 F4i bogging down - TFI installed-img_0450.jpg  

Last edited by mjobie12; 08-03-2010 at 03:05 PM.
  #2  
Old 08-03-2010, 06:50 PM
tanrush's Avatar
Member
Join Date: Jan 2010
Location: Parts Unknown, TN
Posts: 85
Default

Three words, Fuel Pressure Regulator. A bad one made my life hell. After a couple of months of doing everything else a new one fixed my problem. Now it runs like a bat out of hell. It is cheap 65.00 from Honda and easy to install. Search other FPR posts, their is a good tutorial on how to change it out.

Poor gas mileage 25 mpg.
Strong gas odor parked and running.
Black/rich carbon on tail pipe.
Bike ran like crap. Had a terrible time getting it to move in first gear. Not as bad of a problem in 3rd + gears.
Good luck
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
hooberjabber
CBR 600F
2
05-06-2012 11:08 PM
Dave600
F2 Tech
0
08-12-2011 08:42 PM
chris45601
CBR 600F3
4
06-21-2010 12:13 AM
mda0303
1000 Modifications
5
05-19-2009 06:37 PM
fiveoh
CBR 929RR
1
03-03-2008 09:17 PM


Thread Tools
Search this Thread
Quick Reply: '01 F4i bogging down - TFI installed


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.