adjusting jets on carb

[BukkShot]

I recently put a shorty exhaust on my 250 and am getting ready to remove air box and go with pod filters. I know the carb jets will need to be adjusted but I'm not sure how difficult it would be. And advice or input would be greatly appreciated. Thanks

[MrAtom]

Pod filters are a bad idea. Paging @Ghostt

[BukkShot]

Why

[Ghostt]

@MrAtom, I'm here,


one more time,

I would highly recommend that you DO NOT REMOVE THE AIR BOX, the carburetors on the bike are CV type and need to box to function properly, buy a K&N that fits the OEM airbox(K&N KA-2508 Kawasaki High Performance Replacement Air Filter by K&N* *Amazon.com: K&N KA-2508 Kawasaki High Performance Replacement Air Filter: Automotive* ) that's the short version.

Long boring but important answer, CV carbs stands for "constant velocity". The function of the carbs is dependent on having a calm reservoir (airbox) from which to intake air at said constant velocity. Pods draw from the turbulent, unpredictable air swirling past them as you ride, which is anything but constant. Other carbs work fine with pods. CV's = no bueno, save yourself the headaches.

Now onto jetting, first you need to tune the idle mixture screws first, I recommend 3 full turns out from bottom as a good starting point, then fine tune them afterwards. As far as buying a jet kit, I personally don't have one on either my 250, or 500 ninjas. I did got up one size on my main jets, due to they are lean from the factory, and shimmed the main needles with a small washer.


For all your carburetor needs PM @ducatiman

[BukkShot]

Ik So If I Just Go With The k&N Aftermarket Air Filter I Won't Need To Re Jet MY Carb right?

[Ghostt]

Originally Posted by BukkShot

Ik So If I Just Go With The k&N Aftermarket Air Filter I Won't Need To Re Jet MY Carb right?

I would strongly suggest you tune the idle mixture screws, here a how-to

Your initial setting should be 3 full turns out from the bottom, remember just slightly tighten them, don't go all Conan on them.



Then warm it up, slowly turn 1 side pilot screw in until the rpms drop, then back out till RPM's peak (and no further)* Twist throttle...see how it reacts...tweak to taste.
Repeat on other side... test ride. You're looking for best throttle response and transition from just cracked to 1/4 throttle opening or so.*

Thats a quickie, 10 cent tutorial on setting pilot screws.**

Then once you have that set to your liking, then I'd try shimming the main jet needles, start with one washer, then two if necessary. If you still feel it running lean, the go up 1 size on the main jets

Remember tuning the carburetors is a slow process, but once it's done, it's done right.

Your only doing a slip-ons so no real big change as far as the engine is concerned, just tune the carburetors properly, and you'll be set.

Below is some pictures that explains what each part of the carburetor is responsible for.

SIDENOTE: this is all assuming that your carburetors are in 100% condition.

[agentbad]

Originally Posted by BukkShot

Ik So If I Just Go With The k&N Aftermarket Air Filter I Won't Need To Re Jet MY Carb right?

No but a washer or 2 under the carb needles might be in order. You can shim the needles without pulling the carbs off.