F4i - Main Forum Main F4i discussion board

01 lacking power in high range rpms

Old 05-26-2014, 10:47 PM
Thread Starter
Join Date: May 2013
Location: Gaylord, MI
Posts: 38
Default 01 lacking power in high range rpms

Okay so starting today, my bike starting lacking serious power in the higher rpm range, maybe starting at 7k and up. Itll pull decently before that (or so it seems) then it wont have enough juice to pull when it get up there in the rpms, Im talking like its hard to even redline it in first gear bad. A little about my bike, it has a new cnc(?) fuel pump within the last 2 months because i changed the fuel filter as well and just changed it cause I was already in there,7100 miles on it, did cct this winter.

Im just looking for some direction on where to look, the only thing I can think of is: A. bad gas- I put some gas in it that came from a gas station Ive had troubles before with where there has been water in the gas. B. The fuel pump is louder than my old one, Should I be looking there? C. The day prior, I had a battery cable come loose so it was cutting power in and out and had to ride it that way for maybe 20 miles cause I didnt have any tools, possibly losing juice that high if I didnt get it tightened enough?

Its got a power commander, and I changed the fpr about a year ago, but I guess I shouldnt really rule the fpr out. Also, maybe since it kept cutting power to the bike a couple days ago and I rode it for a bit to get to my tools, maybe the plugs fouled from unignited gas? The thing is, I rode it for half the day and it was fine today, just the second half I noticed it. Im also not sold on the bad gas thing either cause I feel like it would do it throughout each gear, not just top end of them. Im weary on the fuel pump cause I just changed it. Any tips would be stellar. Thank you
Old 05-27-2014, 03:19 PM
Senior Member
Join Date: Jul 2008
Location: Mesa AZ
Posts: 2,001

Lots of options here. Check fuel pressure, and check the charging system. You have too many variables right now to go in a specific direction.
Related Topics
Thread Starter
Last Post
Stunters Corner
02-03-2013 01:38 PM
CBR 600F4
03-15-2011 11:13 AM
General Tech
02-25-2009 05:02 PM
F4i - Main Forum
01-20-2009 05:22 AM
Other Bike Chat
12-13-2005 01:01 AM

Thread Tools
Search this Thread
Quick Reply: 01 lacking power in high range rpms

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.