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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.

Oct 28, 2015 | Cars & Trucks

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How to adjust carb settings


Hi Charlie.<br />Operations to be performed depends on how much tuning is needed.<br />Carb setting regulates the ratio between air and fuel in the mixture aspired into the cylinders.Optimal air/fuel ratio is usually around 14(air) to 1(fuel). I illustrated the complete job with cleanup and jet replacement and adjustment. In some situation you do not need to perform complete tuning, which involves taking apart the carburetor. In that case perform basic regulation setup using the two adjustment screws at one side of the carb. Adjustment simple procedure starts from part 2/Adjustment. A good approach is first doing adjustment using idle and thickener screws. Then do the whole tune up if the simple adjustment does not work.<br />The complete tuning is based on carburettor cleanup, regulation of main jet and idle jet and needle setup.<br /><br />Part 1 : Complete tuning and cleanup:<br />1. Take apart the carburettor,<br />2. Undo the float chamber(6 in diag) held by screws (26 in diag).<br />3. Clean bowl with with carb cleaner (put a lot of it in the bow, wait a bit and dispose it-finish the job with a cloth if needed) . Clean floats (nr.4) and other parts using carb cleaner and cloth.<br />4. Use a flat screwdriver to remove the main jet screw (placed in the chamber, held by big golden screw, goes between the floats). Spray the main jet. You must be able to see through it.<br />5. Use the carb cleaner to clean the accelerating pump and all the other parts inside the part. Needle and small parts must be cleaned. Clean the idle jet, which is the smaller golden screws. If you have a compressor blow into the jets (you can blow them even without compressor, but follow H&S).<br />6. If possible replace main and idle jets. Sometimes you may like to replace the jet with a bigger one to get a richer mixture.<br />7. Adjust the needle if needed. A lower needle settings means a richer mixture.<br />8. Remove idle adjustment screw (7) and main adjustment screw(31), clean them screw them back in without tightening and perform part 2. Leave the screws about one and half turn from all way in.<br /><br />Part 2: Tuning and minor cleanup - Here you mainly operate on idle and air (thickener) adjustment screws (8 and 12 in diag)- Start from here, if this does not work, do part one:<br /><br />1) If the engine runs start from idle adjustment: screw or unscrew the idle regulator to adjust the idle speed, the screw is placed to one side of the carburetor and has a spring (part 12).<br />Keep idle least slightly higher than the minimum needed. Example, if the engine stays on slightly below 1000 rpm, set idle to a bit higher with engine revving above 1000 rpm.<br /><br />2) The thickener, placed near that of the minimum screw regulates the air flow. Tighten the screw and unscrew 2 turns from all the way in. Do regulation from this position. <br /><br />Here carburetor diagram and part list. The diagram is taken from service manual. The manual for Lifan 150 (does not include carb setting) has been uploaded here:<br /><br />http://www.mediafire.com/?o3r8x2ujrdbfb6o

on Oct 29, 2011 | 2008 Lifan Delta 250 V Twin

1 Answer

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.

Mar 03, 2011 | Yamaha V Star Silverado Motorcycles

1 Answer

Only runs with the choke on


The choke does 2 things. It makes the mixture richer with more gas, and it also raises the idle speed.
Try adjusting the mixture. If it has no effect, the idle circuit in the carb is plugged and needs cleaning.
If it helps, then you probably have an intake leak somewhere.
If it is just the idle speed that matters, then try just increasing the idle speed adjustment, or make sure the plug is not fouled or anything else that could make it run bad.

Jan 30, 2011 | Coleman Powermate Powermate 5000W...

1 Answer

Will only stay running if choke is pulled all the way out idle screw adjustment has no effect


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

Aug 30, 2010 | 2005 Honda VT 750 Shadow Aero

1 Answer

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.

Aug 22, 2010 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

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.

cadcd19.jpg

Jul 31, 2010 | 1981 Ford Bronco

1 Answer

10HP Subaru/Robin gas on generator engine only runs smooth with choke half on, what can cause this? also the extra jet on the outside of carb what does it do?


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.

Jun 29, 2010 | Coleman Electrical Supplies

1 Answer

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.
Now ride at full power and see how well it performs. If the engine cuts out or surges at full throttle, that means the main jet is too small. If the engine produces black smoke from the exhaust and doesn't seem to produce enough power, then the main jet is probably too big. Confirm the main jet correctness by looking at the color of the spark plug: white or light tan = too lean (main jet too small). Dark brown or black = too rich. Dark tan to brown color = perfect.

Nov 29, 2009 | 2000 Honda XLR 125 R

2 Answers

Will not stay started unless choke is out


Sounds like you have got dirt in the idle jets

Aug 27, 2009 | 2003 Honda VTX 1300 Retro

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