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Boonie

fuel/air screw on 05' 450 carb???

10 posts in this topic

I want to buy an aftermarket fuel/air screw.........probably zip-ty or moose for my new ride. I've read where some of you have already put them on your 05's but I can't seem to find the damn thing on my bike. The manual doesn't even mention a fuel/air mixture screw......different wording? There's so much crap around the carb it's hard to see where it would be; and I don't see one.

Would someone who has put one on their 05' be willing to give a verbal description of how to locate it, or even better, a photo?

many thanks in advance!

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I've got an '04, but I'm betting it's in the same place, though I've heard some mention of a "plug" that's been installed over it that you can remove by screwing a self tapping sheet metal screw a few threads into & yanking out with a pliers. The screw is recessed in the bottom of the carb, centered left to right, at the front of the "bowl".

BTW, I got the "storm" screw (banner ad here on TT) & like it alot.

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Pictures: http://www.pbase.com/jdjetting1/yamaha_yzwr

And, just like Jackazz said, it has plug that must be removed. I used a pick with the "pirates hook" tip. It will go in thru the hole in the center and just work it out. A little stubborn (traces of blue loc-tite on the edges) but it will come out fairly easily. For grins screw the stock one all the way in and count the turns, mine was about 1 1/4 out. After jetting and installing the zipty fuel screw adjuster, it is 1 3/4.

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Well if yours was like mine you wont find it, mine had fallen out and all I could see with a mirror was the hole that went to the intake tract of the engine.It either came that way from the dealer(maybe them playing with it before I picked it up,and backed it out too far). Or they loosened it up and within the first couple of rides it fell out.

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Pictures: http://www.pbase.com/jdjetting1/yamaha_yzwr

After jetting and installing the zipty fuel screw adjuster, it is 1 3/4.

Did you change any of the jets?What is the elevation you ride at.I am starting on working on jetting this beast.I put in a JD needle from my DRZ I think It may be rich at higher elevation (3000 ft).It was missing at 1/4 throttle and it would start when cold with out using the enrichiner.When I got home (300ft) it ran good

Thanks,Lug

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So Texas,

Looking at your gallery of photos, I zoomed to the photo that shows the bottom of your carb where you are accessing the main jet and there is a red round knob......would this be it?

If it is, then when the carb is attached, the screw is actually hanging upside down off the bottom of the bowl?

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If you want to save $20. bucks, simply take a red butt splice electrical connector and push it on the stock fuel screw (after you remove the plug). Put a mark on it with a sharpie pen so you can count the turns. Works great, I have been doing it that way for years. :cry: Smitty

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That's a good budget tip Smitty, BTW, You don't live in Hooterville, do you?

If you are gonna spend the $20, I reccomend the Storm Screw as it has the grooves & #'s on it which can be seen & felt really well, & this helps alot for counting turns when adjusting. Also the way mine is positioned, I know that if I see #4 from the left side of the bike that the screw hasn't turned it'self from vibration. Not shown on the pic on their website is that they now put a small groove on the shaft of the screw with a greased o-ring in it to help keep the screw from vibrating loose.

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I am the the Hooterville Smitty.... :cry: When are we going to ride? I just bought a 05 wr450... :cry: give me call...smitty

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