2004 wr450f bucking in top gear @ low RPM's
Posted November 13, 2008 - 11:42 AM
While on the road holding a steady speed say in 5th gear at low RPM's (4000-5000) I get, a for the lack of the correct term... bucking.... In lower gears at the same rpm's it does not seam to be as pronounced. This correlatets to the 45-50mph range which is where I seam to spend alot of time. Is this in the realm of jetting or is it more of a mapping issue? Even if it is a mapping issue are there settings to minimize the issue?
Thanks for any help offered!!!!
Posted November 13, 2008 - 12:00 PM
Posted November 13, 2008 - 12:23 PM
Posted November 13, 2008 - 01:26 PM
Posted November 13, 2008 - 01:31 PM
Posted November 13, 2008 - 01:57 PM
By disconnecting the TPS any idea of what I will be loosing there???? I have been away from tuning for awhile but I always recall there are usually trade offs...... Day in and day out I'm more concerned about the 4 to 6K RPM range not what is happening at 10K. Thanks for the help!!!
I disconnected it for a while on my 04', I did not experience any trade off other than the desired result which was the "stuttering" going away while at low RPM cruising speeds. I later plugged it back in because I only rode the bike off road and hence never experienced or noticed the stuttering.
Posted November 13, 2008 - 01:58 PM
Any thoughts on the Vortex CDI??? After reading another thread it appears to have solved the same problem that I'm having..... but at almost 5 bills thats hard to swallow.
Posted November 13, 2008 - 04:55 PM
Posted November 13, 2008 - 05:16 PM
Posted November 14, 2008 - 04:03 AM
Posted November 15, 2008 - 04:36 PM
On my '03 it appears to be built into the carb. You might look for other posts. Also, on both I needed to go up a size on the main jet after usual mods.
Posted November 15, 2008 - 07:26 PM
Posted November 16, 2008 - 06:47 AM
I just pulled the carb off last night just to make sure I knew what I had for jetting... and it is all stock. So before I button her back up...... any strong suggestions on jetting???? As stated before engine and carb are stock, air box has been opened up, GYTR exhaust insert, gray wire cut and o-ring mod done. I received one suggestion to drop the stock needle one..... I would think, with it breathing a little easier and currently all stock jetting I may want to fatten it up a bit not lean her out more??? but this is why I'm asking, because I don't know!! I'm also looking more for the smooth and reliable side of the equation. I would certainly give up a couple hp at the top for a stronger mid range. I appreciate all recommendations!!!!
Posted November 16, 2008 - 08:09 AM
Posted November 16, 2008 - 05:18 PM
Thanks and I will probably pick up a bigger rear sprocket as well
Posted November 16, 2008 - 06:27 PM
Posted November 16, 2008 - 06:56 PM
Posted September 30, 2014 - 06:30 AM
Confused. an 04 with a TPS?
They put a TPS on bikes with Fuel Inj.I thought
My 06 has a card, so how can an 04 have FI ??
Posted September 30, 2014 - 07:22 AM
Bucking? In top gear at low RPM? Downshift.
Jetting/ignition changes will not solve a 'problem' that really does not exist. You have a race bike, not a cruiser. RPMs should be above 6K most of the time.