1990 Suzuki GSX-R 750 L Logo

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phil inglis Posted on Jun 15, 2017

1990 Suzuki GSX-R 750 L carburetor tuning

Fuel mixture screws are currently 2 turns out, k&n filter fitted in standard air box with micron 4-1 SS exhaust fitted too. Lots of black deposits around the end of the race can, bike smells rich too. Recently there was a leak in the vacuum pipe; a new pipe has been replaced. Also, fuel tap diaphragm had been fitted incorrectly, this has now been rectified and fuel tap also cleaned out. The bike will do over the ton no probs but just smells rich and lumpy at idle.

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Anonymous

  • 1 Answer
  • Posted on Apr 09, 2009

SOURCE: looking for the air fuel mixture screws on carb any help?

[IMG]http://i199.photobucket.com/albums/aa59/88gixxer/100_4177.jpg[/IMG]

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Marvin

  • 85242 Answers
  • Posted on Sep 28, 2009

SOURCE: need to know how to tell if a 750 or 1100

the cc's of the engine is marked on the crank case top near the side cover for the clutch, u will need to remove the fairings to see it.

Testimonial: "thanks for the help much apprecated"

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Marvin

  • 85242 Answers
  • Posted on Mar 23, 2011

SOURCE: suzuki gsxr 750 1994 garaged

Hello
Having owned this (mine was a 91) model and knowing allot of Suzuki owners over the years the problem here is the fuel valve (called a Petcock valve) is defective, they sick, the reason is that the valve is operated by engine vacuum, so it only delivers fuel when the engine is cranking over or running, the only exception to this is the so called Prime position marked with a "P" on the valve. The hose consist two small vacuum lines from the engine that operate the valve in the run and reserve position and the large line is the fuel delivery hose to the engine. My advice is to mark the lines with tape, remove the fuel tank and replace the fuel petcock valve with a new one, this will also eleminate the other nasty problem this valve has, the rubber O ring fails and it leaks fuel all over the engine fairings and runs the paint, this happened to my bike.

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1answer

Where is air/fuel screw on a suzuki vs 800 intruder

The air/fuel mixture screw on a Suzuki VS800 Intruder is typically located on the carburetor. To adjust the air/fuel mixture, you'll need to locate the carburetor and look for a small screw that can be turned.
Keep in mind that the exact location of the screw may vary slightly depending on the model year and specific carburetor version on your VS800 Intruder. Generally, it is located on the bottom or side of the carburetor.
Here are the general steps to locate and adjust the air/fuel mixture screw:
1. Locate the Carburetor: The carburetor is usually positioned on the side or underside of the engine. Follow the intake manifold or air filter housing to find the carburetor.
2. Identify the Air/Fuel Screw: Look for a small screw on the carburetor. This screw is typically flat-headed and may be recessed. It is often located near the bottom of the carburetor.
3.Adjustment: With the engine running at idle, use a screwdriver to turn the air/fuel mixture screw. Turning it clockwise (in) usually leans out the mixture, while turning it counterclockwise (out) enriches the mixture.
4. Listen to the Engine: As you make adjustments, listen to the engine's sound. The goal is to find the point where the engine runs smoothly and the idle is stable.
5. Fine-Tune: Make small adjustments and give the engine a moment to respond before making further changes. It's a process of trial and error to find the optimal setting.
6. Check the Owner's Manual: Refer to your motorcycle's owner's manual for specific guidance on the location and adjustment of the air/fuel mixture screw. The manual will provide information tailored to your bike's make and model.
If you're uncomfortable making these adjustments yourself or if you're unsure about the location of the screw, it's advisable to consult a professional mechanic or refer to the specific service manual for your Suzuki VS800 Intruder.
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2answers

97 katana 750 carburetor air/fuel screws.

Mentioned here. the standard is normally screw in lightly and back out 1 1/2 turns.

Carb air/fuel mix screws - KatRiders.com

https://katriders.com > forum > mechanics-101 > 48187...
Apr. 21, 2009 - Starting with carb #1, turn the mixture screw 1/4 turn at a time in or out till the bike idles the fastest. If the idle speed comes up a lot, turn it back ...
15 posts · Hi, i'm overhauling my carbs, and i noticed that someone in here said something about 1 and ...
Air fuel mixture screws - KatRiders.com
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Good video instruction here as well

https://www.google.com/search?q=97+katana+750+carburetor+air%2Ffuel+adjustment
Jun 20, 2021 • Motorcycles
0helpful
1answer

97 Suzuki Katana 750 carburetor air/fuel screws.

Mentioned here. the standard is normally screw in lightly and back out 1 1/2 turns.

Carb air/fuel mix screws - KatRiders.com

https://katriders.com > forum > mechanics-101 > 48187...
Apr. 21, 2009 - Starting with carb #1, turn the mixture screw 1/4 turn at a time in or out till the bike idles the fastest. If the idle speed comes up a lot, turn it back ...
15 posts · Hi, i'm overhauling my carbs, and i noticed that someone in here said something about 1 and ...
Air fuel mixture screws - KatRiders.com
15 posts
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14 posts
May 11, 2014
Pilot Screw settings - KatRiders.com
8 posts
Feb. 19, 2015
Question Drilled Air Screw Plug on my '90 GSX600F ...
13 posts
Jan. 26, 2017
More results from katriders.com


Good video instruction here as well

https://www.google.com/search?q=97+katana+750+carburetor+air%2Ffuel+adjustment

..
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1answer

1988 Suzuki GSX 750 bogs at 5000 rpm under load

simple fix. your air fuel mixture is not right. usually the first step is to get you carb cleaned and replace your air filter
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1answer

On my gsxr 750 l (1990) when doing about 30 mph@3000rpm the revs are up and down, almost mis-firing, have removed,cleaned and balanced carbs but problem still there. any ideas?

Check the color of the spark plugs.
If they are totally clean, your mixture is a little to lean.
To richen the mixture at the half-way trottle, raise the fuel level in the carbs.
At closed or less than 1/4 open trottle, set with the mixture idle screws.
Check also the rubbers between carbs and cilinder head. They must be 200% air-tight!
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