Jetting for 05 450r

[Prazak250EX]

So I pulled the jets out of my bike to see if they were clogged and they definitely were. All kinds of nasty looking stuff inside each jet so I cleaned them out. To my surprise, the quad ran worse than what it did before I took the carb off, and now it's overloading like a son of a B****. I can see the fuel coming out of the back of the carb when I have the airbox off and I stab the throttle. The main jet I pulled had the numbers 185 on it. I'm not familiar with jetting a carburetor, but I know enough to rebuild the carb. Aren't the stock jets supposed to be like a 128 or something? Could this be the problem?

I have no airbox lid, stock exhaust, stock bike, etc. I'm trying to jet the bike for South Florida weather, and I'm wondering what size jets I should put in there. Anyone have any recommendations? :ermm:

[New450r]

Non Hrc main jets are 118 where hrc are 185 Im guessing yours is Hrc equiped.

[ghott]

If you are running no airbox lid, a 185 main is correct.

Did you check the pilot circuit? What size is the pilot jet? Did your A/F screw fall out? If not, how many turns out is it? Do you have the HRC Needle? What clip is it set on?

Also, what fuel are you using?

[Prazak250EX]

a/f is at 1 and 3/4 turn from a stop. Main jet is now 160, I got the dynojet kit and followed the directions down to a T. Jet needle is from Dynojet, and it's on the third clip from the top (as stated in the directions). She seems to run much better now, but there is still a bit of stutter to her.

[New450r]

Dyno jet sent me jets of that size and they are way to lean. try a 185 and 2 turns out. Thats how mine is runs great.

[outkast]

My mates 450 has pipe, K&N , HRC cam etc, he was running a 190 jet but just was not right, we messed about a bit and got it running much better with a 180 jet.

sometimes its better to drop a jet size or two.

[400exrider707]

Originally posted by New450r
Dyno jet sent me jets of that size and they are way to lean. try a 185 and 2 turns out. Thats how mine is runs great.

Dyno jet compared to kehein jets are completely different sizes even if the number is the same. A 160 dyno will flow more fuel than a 160 kehein.

I think you are still too rich, but very hard to tell via the internet.

[3x440ex]

You're way too rich........just for now pull your baffle out and see how it runs with the 160. You're letting more air in but not out.

[KFX440ROX]

I have 185 main, HRC needle, stock pilot, open air box, HRC pipe end cap, hotcams stage 2 and it runs great. i live in oklahoma 600-800 feet above sea lvl

[chayes627]

so with the hrc lid and baffle removed main jet should be about 160? what about the pilot jet... one size up from stock? and any adjustments to the leak jet?

[86250rrider]

open lid, slip on,hrc needle 3rd clip, 185 main ,52 pilot works great on mine. im not into those dyno-jet kits myself. my jetting kit was 2 jets and a needle for$20 total.:D the hrc needle helped a bunch on mine...well worth the 10 bucks i got it for