I just rejetted my F4 last night. After installing my Yoshimura Competiton Pipe and K&N filter, it was sluggish up to 5500. It was beginning to get on my nerves, and even though Yosh said no rejetting req'd, I bought a FactoryŽ Config. 10 kit. K&N said it was a good thing to do.
I still have a little bit of adjusting to do, but I'm fairly good with carb & engine work, so I should be alright.
To get to the point though: I took it out last night after installing the kit and doing the initial adjustment to see how it would run. This of course after I reassemble most of my bike and forgot to turn the fuel back on (duh
). Anyway...I decided to ride without any fairing to save some time. I took it out and immediately noticed it ran lean below 6500. After that the midrange rush was stellar. I took it on the interstate and this is where things became REALLY interesting. I was cruising along at about 80mph when I decided to do a 6th gear roll-on, you know...see what kind of response I was getting. I did so and was pleased with the results.
The amazing thing though was that at about 120mph (around 10,000 I believe) the bike started to bounce the front tire off the ground. I mean it literally pulled the wheel off the ground about 6inches then dropped it again, then kept up with these little 3inch bounces. I was friggin' astounded. There wasn't any wind or anything last night either.
I know 600's are powerful, but that was crazy. Anyway, I can't wait to get home from work today and see what it can do on the low end once I raise the floats and adjust the fuel mixture screws.
I've heard a bunch of people say that rejetting did nothing for them, but it certainly helped me. I'd be interested to hear anyone else's "rejetting tale" and how it helped/hurt their performance.
P.S. Just to clarify. I WAS in 6th gear. Not a mistake. UNbelievable I know...
Piped, Jetted, totally trick...
Keep the Rubber side down
my Bruthas AND Sistas!!!