Question about Suzuki GSF 1200 Bandit Motorcycles

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What do the screws on the side of the carbs change on my 97 bandit 1200? Can that help adjust the jetting for slightly colder weather?

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  • Suzuki Master
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No only thing u need is the choke on longer

Posted on Oct 08, 2010

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What is the initial carb settings on the carb?


screw jets in untill they bottom out slightly then--
high jet one full turn out
low jet one and a half turns out
slight adjustments might have to be made once unit is running
hope this helps

Sep 04, 2015 | Husqvarna Models 181, 281, 288xp

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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

Poping in crub


I think you're talking about "popping in carb". This is because your carb is jetted too lean from the factory. They have to do this to meet EPA regulations. You need to change the slow speed jet in your carb from a #42 jet to a #45 jet. Making this change will usually require that you drill out the "anti-tamper" plug that covers the idle mixture adjustment screw so that the idle mixture can be adjusted for the new jet.

Also, you need to remove the slide from the carb and remove the needle. With the needle out, slide a 3mm flat washer on the needle from the "long" side. The small flat washer is approximately 0.020 to 0.023" thick. This will raise the needle by this much slightly enriching the mid-range mixture. You can use a little grease to hold the washer on the needle while you reinstall it.

This is a relatively complicated job in that it requires the removal of the carb from the engine and disassembly of the carburetor. It is also a job that I do not recommend for the amateur mechanic.

Good Luck
Steve

Nov 09, 2010 | 2003 Harley Davidson XL 1200 C Sportster...

1 Answer

I have a primary jet and secondary jet in the carburator of the 500 gl silverwing . and the jets I have is 75 and 125 which goes where . and what should be the setting on the air jet ?


The secondary main jet (125) goes into the jet needle holder in the center of the carb (needle). The primary main jet (75) is between the secondary main jet and the pilot screw (this one is slightly off center) . The start setting for your air screw should be 1 3/4 turns. Warm up your engine and drive for ten minutes. Adjust your idle speed to 1100 + or - 100 rpm. Now turn pilot screw in or out to get highest idle speed. Readjust idle to 1100 rpm. Now turn pilot screw in till idle speed drops 100 rpm. If pilot screw seats go to next step. Adjust the pilot screw out 1 full turn from 100 rpm drop point. Now reset Idle to 1100 rpm. That is how Honda says to set your air screw. Standard setting is probably sea level and going through the procedure will set you up for the altitude where you ride. Do the adjustment during good weather at the altitude you plan to do the most riding.

Aug 27, 2010 | Honda CX 500 B Motorcycles

3 Answers

'bogging' down in low gear


your carbs will need a good service ,pinning the throttle wide open wont help either ,so open throttle slowly. I expect your needle valve in the carb has gone oval ,it should be round allso check the needle condition no scores, but first clean and adjust your pilot screw,best thing is to get a haynes manual to find the proper setting for it,but quite simple to do.

Mar 12, 2010 | 1993 Suzuki GSF 250 Bandit

1 Answer

I have the same idelproblem with my bandit carb


When you want to change jets for more fuel.. they actually come in Jet Kits. you can try different sizes but will have to change 3 knobs for proper mixture of gas/air ratio. The knob adjustments you just have to try one at a time for proper adjustment and only turn 1 knob 1/4 turn at a time. Tightening the knob makes less gas flow and loosening allows more gas. the three knobs are for 3 different ranges of RPMs. there is a low mixture knob, mid range knob, and high rpms knob. for example if your RPMs at idle through 5k RPMs are boggy, you can try a 1/4 turn and if it gets worse do a half turn back and ride again. do this off the street where you won't disturb traffic. it takes a while to get it running properly mixed.

Oct 20, 2009 | 1992 Suzuki GSF 400 Bandit

2 Answers

How do i adjust the carb for a lean idle and a rich throttle on a 97' harley sportster 1200


I'm having trouble with the carburetor on a Sportster. I just change the jet kit on it and the intake seal and the spark plug. But i still doing the say thing. When to get hot it hesitation and stalling. Can you help me on this one thank you.

Aug 19, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

2 Answers

I always seem to be either changing my idle jets or enrichner why do i need to change these when the weather changes if i dont my bike will pop and backfire.


Different densities in the air charge will cause this. Colder weather equals a denser air charge, and vice versa. If you can find one in between, this may help with the problem, but may still need the idle fiddled with depending on the temps.

Jun 09, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

1200 bandit choking up under 3000rpm


Sounds the pilot passages and or the needl jet air passages are blocked on the carb for that cylinder that is not fireing. The carb should be removed from the bike and disassembled and dipped in carb cleaner. What I think works best for cleaning carb is Yamaha's Carb Dip I mix it 50/50 with warm water. All the rubber parts must be removed as they will be swell and be damaged by the dip. After you dip the carb will need to verify all passages with spray carb clean to make sure the fluid will make it through the intended passage.

May 25, 2009 | 1999 Suzuki GSF 1200 Bandit S

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