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Old 02-16-2009, 10:56 PM   #1
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can anyone tell me what area is affected by the fuel screw on flat slides. i know the air scew is idle - 1/4. thanks
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Old 02-17-2009, 06:51 AM   #2
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My understanding is that the fuel screw is also the same range. It effects idle to about 1/4 throttle.
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Old 02-17-2009, 09:21 PM   #3
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thank you , i like tuning, i've owned a lot of triples(tuning a must) . The twins with flat slides are new to me .
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Old 03-04-2009, 12:44 PM   #4
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Carbs either have air screws or fuel screws. They both control idle to 1/3 throttle mixture. If the screw is before the slide it controls how much air gets into the mixture, so the more turns out the leaner the low speed mixture is.

If the screw is in front of the slide it's a fuel screw, so the more turn out the richer the mixture is.

Round slide carbs have air screws, most flat slide carbs have fuel screws.
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Old 03-05-2009, 05:24 PM   #5
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<div class='quotetop'>QUOTE (twinrats @ Mar 4 2009, 02:44 PM) <{POST_SNAPBACK}></div>
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Carbs either have air screws or fuel screws. They both control idle to 1/3 throttle mixture. If the screw is before the slide it controls how much air gets into the mixture, so the more turns out the leaner the low speed mixture is.

If the screw is in front of the slide it's a fuel screw, so the more turn out the richer the mixture is.

Round slide carbs have air screws, most flat slide carbs have fuel screws.[/b]
This may seem like common sense to an extent. But very simply put, yet well explained. Thank you very much for such a great, simple clarification.
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Old 03-11-2009, 11:41 PM   #6
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The Mikuni flat slides used on Cats have both a fuel and air screws for low speed adjustment.
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Old 03-13-2009, 08:31 PM   #7
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To the best of my knowledge there are only 2 screws on a flat slide carb I can try to provide the cat microfiche if need be. One being the IDLE SPEED SCREW which controls the height of the of the throttle valve allowing more or less air to rush through the venturi drawing more or less fuel through the idle,off idle or main circuit of the carb. the other is the PILOT AIR SCREW which is a factory determined setting allowing a certain amount of air to mix in the IDLE ONLY circuit pulling fuel from the pilot jet at a factory determined amount. the idle speed is determined by adjusting the height of the throttle valve allowing more air to rush in the carb pull more fuel through the pilot jet and mix in the venturi. The off idle and high speed is controlled by the main jet needle moving up with the trottle and allowing more fuel to pass through the main jet into the carb and mix with air in the venturi.


sorry for the huge speech but I thought this may clear it up carbs can get confusing
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Old 03-15-2009, 03:35 PM   #8
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<div class='quotetop'>QUOTE (A&J @ Mar 13 2009, 08:31 PM) <{POST_SNAPBACK}></div>
 Quote:
To the best of my knowledge there are only 2 screws on a flat slide carb I can try to provide the cat microfiche if need be. One being the IDLE SPEED SCREW which controls the height of the of the throttle valve allowing more or less air to rush through the venturi drawing more or less fuel through the idle,off idle or main circuit of the carb. the other is the PILOT AIR SCREW which is a factory determined setting allowing a certain amount of air to mix in the IDLE ONLY circuit pulling fuel from the pilot jet at a factory determined amount. the idle speed is determined by adjusting the height of the throttle valve allowing more air to rush in the carb pull more fuel through the pilot jet and mix in the venturi. The off idle and high speed is controlled by the main jet needle moving up with the trottle and allowing more fuel to pass through the main jet into the carb and mix with air in the venturi.


sorry for the huge speech but I thought this may clear it up carbs can get confusing[/b]
Take a look at this post on HCS. All these guys can't be wrong. http://www.hardcoresledder.com/forums/inde...r+800+high+idle My carbs have both a fuel and air screw for low speed.
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Old 03-15-2009, 08:46 PM   #9
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what im saying is that by fuel they must be refering to the idle speed screw which will raise the throttle valve allowing more air to pass through pulling more fuel through the idle circuit. Raise it to high and you'll pull fuel from other circuits same as when you pull more throttle it then allows more air to pass through pulling fuel through the other circuits of the carb

just saying I think there is a common misconception of the name because it doesn't actually just add more fuel
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Old 03-16-2009, 01:52 AM   #10
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<div class='quotetop'>QUOTE (A&J @ Mar 15 2009, 08:46 PM) <{POST_SNAPBACK}></div>
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what im saying is that by fuel they must be refering to the idle speed screw which will raise the throttle valve allowing more air to pass through pulling more fuel through the idle circuit. Raise it to high and you'll pull fuel from other circuits same as when you pull more throttle it then allows more air to pass through pulling fuel through the other circuits of the carb

just saying I think there is a common misconception of the name because it doesn't actually just add more fuel[/b]
A&J, Read the post from HCS. You will learn a lot. It even tells you where the air and fuel screws are located. The carbs are mounted on a rack and tied together. They have solid linkage bar between the carbs that is tied to a single throttle cable. There is only one idle screw for both carbs and it is on the rack between the carbs.
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