Performance enhancements for f2's - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 4 (permalink) Old 07-19-2000, 06:15 AM Thread Starter
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Join Date: Jul 2000
Location: Elk River, MN
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Just wondering what some of you f2 riders have done to squeeze alittle more performance out of your bikes?
Put a race only Yoshi slip-on on it this spring and I'm wondering if I need to rejet?
There is alittle more midrange pull, but now when I do low rpm shifts (not often) it seems to cut out alittle when I'm not on the throttle.
As soon as I get on it, everything is there.
No big deal, but I'm wondering if not rejetting will hurt anything.
I'm from Minnesota and more of a 2-stroke snowmobile junky with limited knowledge of 4-strokers.
Thanks in advance.

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post #2 of 4 (permalink) Old 07-19-2000, 07:35 AM
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yes, try a factory configuration 1. my f2 was a lot better after jetting. much bigger gain than a pipe and a powerpak were. i personally don't recommend a k&n, but lots of other people do. it's debatable. but $65 for a maybe it will, maybe it won't, no thanks.

i also found that sintered brake pad were a big help.

f2's also work well some rear-ride height, mine was up about 1/2" with a fox shock.


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post #3 of 4 (permalink) Old 07-19-2000, 07:37 PM
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Location: Winnipeg Manitoba Canada R3T1A5
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You deffinitly need to re-jet, your bike is running to rich, you need to lean it out a bit. More power? Get your head milled, ported and polished. then worry about jetting. Get a DYNO run.
Good Luck.

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post #4 of 4 (permalink) Old 07-31-2000, 01:59 PM
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Location: League City, TX USA
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I have to disagree with our bud from Canada. When you install a free flowing exhaust, you normally should jet the bike to pass more fuel to take advantage of the increased air flow. A K&N filter will let more air in, and the exhaust will let it come out. Without rejetting, the gains will be less....and I mean jetting up, not down, as suggested by our Canadian friend. Normally, a free flowing exhaust has some unwanted affects on low rpm torque, such as the symptom you described F2 does it at light cruising speeds...Mine has a K&N filter, a Vance & Hines full exhaust (SR2 I think...4?) and a jet kit. I bought the bike that way, so I don't know how exactly it was affected-runs good though!
Try a jet kit and filter, and you should be satisfied. Take care and have FUN!


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