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Sled Mods & Tech-Tips Learn the best tips/tricks from people have done it before.

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post #11 of 13 Old 03-16-2009, 08:02 AM
kev
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Sled: 95 ZRT 800 AGLT, 92 Jag 440, 14 XF9000
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At one time I thought the same as A&J.

Having 2 screws makes tuning much more difficult having so many more adjustment possibilities and combination's. If one setting is predetermined there is only one variable to figure out.

The other part I found confusing is the service manual only gives one adjustment which would lead me to think there's only one screw. I'm pretty sure the ZR600 is an example of the style with both screws.

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post #12 of 13 Old 03-16-2009, 08:18 AM
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Flatslide TM carbs have a fuel screw and an aiscrew. There is also a main idle adjuster. The air screw is by the airbox boot. This allows you to increase the air flow into the starter/low speed circuit. The more air you give it the leaner it will be. Too much air and the sled will idle highly and when you come off the throttle it will be slow to come down to idle speed again. The fuel screw adjustes the amount of the air/fuel mixture you send around the slide at idle low speed.
To adjust them correctly you would adjust the airscrew first to obtain the right plug colors. Then you would adjust the fuel screws to clean up the acceleration. If you are getting too much fuel it will be boggy and rich feeling. Too little and it will hesitate and jumpy. All these things are below 1/3 throttle.
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post #13 of 13 Old 03-16-2009, 06:16 PM
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Sled: 05 zr 900
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Wow does my foot ever taste horrible. I have never noticed or heard of a fuel screw on those carbs. I guess that's why they say you will never be able to know everything. The worst part is I've looked right at those screws before and simply disregarded it. Never had one with a problem that I needed to look for it I guess, but you can bet your ass I'll never forget about it now.

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