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There is no main jet adustment. if the choke is pulled out slightly it helps. The Idle mixture adjustment does not see to have any effect. Its been cleaned and taken apart several times and seems to be fine but still runs to lean. There are no aparent vacuum leaks and the fuel is fresh. The float bowl stays full and the fuel pump works fine. The fuel shut off solenoid works fine.

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Still could be a number of things. Sounds like you know your way around mowers so try removing the fuel shut-off and plugging it first. Even if it click when tested...still has been know to be an issue here in the shop. Second guess is that you have a small leak in the carb gaskets. Your that far anyways...rebuild the carburetor. let me know if that dosen't help...www.nnyparts.com

Posted on May 30, 2010

Testimonial: "Great Idea, I went there once and tested the shut off solenoid with a battery and it worked o.k. But I plugged it and tried it without it. Same problem I took it apart once again and found that the main jet sleeve which fits down inside has 2 "O" rings which seemed to be dryed out and cracked. I going to have to get a kit to replace them. Thank you so much for your help. Lee"

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How to adjust a Quadra jet carberator on a small block Chevy.


Hello, It's been a long time since I have adjusted a Quadra Jet. Start the engine and bring it up to running temperature. Make sure the choke is fully off. At idle , turn the right hand idle mixture screw in until you hear or feel the engine start to miss. Back out the idle mixture screw 1/4 turn. Repeat procedure for the left hand idle mixture screw. Adjust idle speed screw to 800 RPM for auto trans in gear or 700 rpm manual trans in neutral.

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Both the Hi and Lo screws are simply needle valves. By turning them you allow more or less fuel to flow past the needle. When you adjust them you are directly controlling how much fuel flows through the idle jet and the main jet.

is your car have a choke plate lever ( for warming up ) (like old fashion ) ?

When the engine is cold and you try to start it with the pull cord, the engine is running at an extremely low RPM. It is also cold, so it needs a very rich mixture to start. This is where the choke plate comes in. When activated, the choke plate completely covers the venturi to see it in action). If the throttle is wide open and the venturi is covered, the engine's vacuum draws a lot of fuel through the main jet and the idle jet (since the end of the carb's tube is completely covered, all of the engine's vacuum goes into pulling fuel through the jets). Usually this very rich mixture will allow the engine to fire once or twice, or to run very slowly. If you then open the choke plate the engine will start running normally.

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I gutted the exhaust and added 120 main jets, shimmed the needles w/ 2 #4 washers and adjusted the Idle Mixture Screw to 3.5 turns out as recomended and the bike sputters in the midrange and higher rpm's...


when you change 3 mixture settings all at once its hard to determine which bit is causing the problem. sound rich so try dropping the needles down. and maybe mixture in half a turn.
Just one thing at a time and keep notes so you can change it back if the adjustment doesnt work
A good test is at midrange, if you pull the choke on does is get better or worse.
At idle does the mixture screws make a difference.

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Take the carburetors apart and clean the slow jets and fuel passageways in the carb bodies. Then bike should idle with out choke.

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I have a Briggs and STatton 24 OHV intek motor on a craftsman lawn tractor. I got it on sale and when I got home it ran rough. The fuel line had collapsed or was plugged with some white powder. I took off...


It sounds like the fuel mixture is running very Lean..There are usually two adjusting screw screws on the carburettor that control the mixture. A Larger one is for the Main Jet and a smaller one for the Idle Jet. There is also an adjusting screw on the throttle butterfly to control the idle speed.
To adjust setup, start with at least a half tank of fuel, and have engine at operating tempurature (That is warm but not overly Hot). As a starting point, loosen (anticlockwise) Main Jet screw about half a turn, to richen mixture,so that engine will run without choke. Run engine at full speed and adjust main jet for highest smooth speed without engine missing due to mixture being too lean or rich.
Allow engine to idle and the adjust Idle Jet Screw for smoothest idle. Idle Speed screw may have to be adjusted if idle speed is too high/low.
Sequence above may have to be repeated to get best running. If engine hesitates sometime when sudden load is applied but then picks up, try adjusting Main Jet by 1/8 to 1/4 turn richer until it handles the load without faltering.

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Hello I have a 1980 Ford Bronco 351 2bbl. Wondering if anyone knows which screws adjust what? Please if anyone has any ideas please respond. Thank you.


Here are some images that might help to assist you, and let me know if you require any further assistance.


Adjust the curb idle with the engine warmed up and the choke off.

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The air/fuel mixture screws should be adjusted with the engine warmed up and at normal idle speed, then turn each air/fuel mixture screw in one at a time until the engine just begins to mis-fire, then back the air/fuel mixture screw out 1-1/2 to 2 turns out a half a turn at a time until the engine idle is the smoothest. (your vehicle might have restrictor caps over the air/fuel mixture screws to limit the amount of adjustment)

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The choke adjustments;

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To adjust the vacuum tension pull on the choke pull-off:

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Adjust the fast idle screw to the proper RPM with the engine cold and the choke on.

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Not sure about the "extra jet" on te side of the carb without a specific model, but running smoothly with half choke indicates that your mixture is lean. Choking it richens the mixture.

The extra jet may be your idle stop, or it could be the idle mixture adjustment.

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In my honda xlr 125 i changed the main jet to #92 and slow jet to #35 is this ok? If so how can i tune the carb. I am from Sri Lanka. Its a tropical country.


The only way to know if the jetting is correct is to see how well it runs - and check the spark plug color.
You can start by warming up the engine and adjusting the idle mixture. Do this by turning the idle mixture adjustment screw (there are only two adjustment screws on the carburetor: one is the idle speed adjustment, the other is the idle mixture adjustment). Turn the idle mixture adjustment screw in or out until the fastest idle speed is attained. Then adjust the idle speed with the idle speed adjustment screw.
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Will not stay started unless choke is out


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