Question about 1988 Suzuki GSX 600 F (Katana)

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Idle speed problems

Got this bike in bits when rebuilding carbs found someone had been in at mixture screws dont know the settings for these and when i was trying to sync the carbs the idle was very eratic near impos to adjust new plugs and filter fited. was trying to sort a small misfire that happen sometimes

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  • Anonymous Mar 12, 2014

    used bike will not increase speed past 45 to 50 mph. Has new plugs and fuel filter. Was sold in the Dallas area and moved to Albuquerque, a 5500 foot change in altitude. Could this be a jet adjust ment in the carbs?

  • Anonymous Mar 19, 2014

    What is the factory setting for the 2001 intruder idle mixture screw

  • Anonymous Mar 19, 2014

    What is the factory setting for the idle mixture screw?


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  • Suzuki Master
  • 767 Answers

Hi Walker14,

You have to sync thecarbs and also you will have to reset the air-fuel mixture screws.
One of the carburators should be factory adjusted, I dont wn a kawasaki but I own a YAMAHA SECA XJ750R and thro it I am sharing my experince.
Once you have located the factory preadjusted carburator you can thn set the others to its specs. I use the feeler gauge to do for my bikes carburators and it works fine.
With regards to the mixture screw..... get the all in tightened but slowly aas to not damage the pin end of it!.
Start the bike and get it to normal running temp and thn set the screws 2 and half turns may need to set your idling speed before you begin this setting of the mixture screws, you prolly will hveto go higher on revs or vicecersa ....onc eyou are at the mixture screws and adjusting them , you will surely note the differenc ein sound of he bike an its idling ..
Hope this will help.


Posted on Feb 02, 2009

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My husband touched the carb settings on my sons new 2007 ttr 50. I read the manual to try and find the number of turns to return to stock settings. Can you please please help!

The carb mixture screw may add air or fuel, depending on the model. If the bike will idle it can be adjusted without knowing the factory setting. What you want is the highest idle that can be achieved using just the mixture screw, not the idle setting screw. Start the motor, then slowly turn the mixture screw in. If the idle speed increases, continue in that direction. If it slows and becomes rough, turn the screw back out until you reach the highest idle speed. That will the correct setting for the bike at your altitude.

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Choke problem

That's an indication that the idle mixture is too lean, as the choke richens up the mixture, allowing it to run.

Your carb should be similar to this:

The AIR SCREW adjusts the mixture (rich/lean), and the IDLE SCREW adjusts the idle SPEED.

Try screwing in the AIR SCREW 1/2 a turn and see if that helps.
If not, try another 1/2 turn.

Still no idle?

Turn the screw back where it was (1 full turn) and then screw it OUT 1/2 turn, then if not, another 1/2 turn.

Once you have the mixture correct, the idle speed can be set with the IDLE SCREW.

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1969 ford mustang revs up on start then immediately dies.

Sounds like carburetor problems. Does the choke plate open enough to keep engine running? Or the fuel level in the carburetor may be too low-adjust floats for that. Check idle speed settings -idle speed screw. Idle mixture setting-the idle mixture needle.
If still no help, buy a carburetor rebuild kit for it-not expensive, will have all new gaskets and the parts that normally wear in the carb. Instruction sheet and a numbered dismantling sequence will be included in the kit. If you have never taken a carb. apart, let someone who has do the rebuild, an awful lot of tiny parts to keep track of, and you cannot let mix-ups occur. One wrong jet in the wrong place, and you will have to do it over. One check ball that wasn't placed, and you have to do it over. Mechanics are glad that carburetor days are over-fuel injection is more reliable, with about a hundred fewer parts to check on.

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My 2008 Kawasaki ZX6R is having some stalling issues at low revs and stuttering issues while in motion. The bike has a power commander V, has been tuned on dyno, has k

firstly thankyou for adding a video allways helps

can u tell me how the bike performs in all revs ?

you say it has been dynoed how long ago ? have you made any changes since ? was it working fine when it left or has it been like it since u got it back from them ?

does it lack power taking off ?

first thoughts its almost certenly the carbs if not possibly a problem with the powercomander but id say 99% sure its carbs but if you took it to pros they shuld have set it all up right

what do it think it could be im thinking sounds like fuel mix problems low end maybe pilot ajustment needed possibly carb sync problem but all should of been addressed at the dyno center

can i also ask how long ago it was dynoed ?

as for something usefull for now here is a little rule for thigureing out air fuel mixes at low rpm and as a genral rule for setting up any stage of the carb idle mid and high rpm

        • NOTE: A rich problem gets worse as the engine heats up.
          • If the throttle is lightly "blipped" at idle, and the rpm drops below the set idle speed, then rises up to the set idle speed, the low speed mixture screws are probably set too rich: try 1/2 turn in, to lean the idle mixture.
        • NOTE: A lean problem gets better as the engine heats up.
          • If the throttle is lightly "blipped" at idle, and the rpm "hangs up" before dropping to the set idle speed, and there are no intake leaks and the idle speed is set at less than 1000 rpm, the mixture screws are probably too lean: try 1/2 turn out, to richen mixture. Be sure there are no intake leaks and the idle speed is set at less than 1000 rpm!

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Hi, I own a Pulsar 150 DTSi (2007). I want to know the correct/most effective technique for setting the idling speed and carburetor volume control screw setting. I have already read many articles on the...

First and formost make sure air filter is clean.Then start bike and warm up engine.with engine warm adjust idle screw(the big screw with spring around it)Turn clockwise to increase and counterclock wise to decrease.with bike idling properly the low speed air adjustment screw (small screw located just above fuel bowl on side of carb)Adjust in small increments 1/16 turns at a time till bike has smooth throttle responce.This screw contols air flow during idle and up to 1/4 throttle.From 1/4 throttle and up the needle setting on plunger inside of carb takes care of 1/4 and up.You usally dont have to mess with needle unless you do upgrades to get more power out of bike.But over time the low speed settings can change due to wear on idle needle and air needle.So thats why you have to make adjustments.If bike still dosent respond or idle correctly I would purchase carb rebuild kit and your problem will be solved.

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I have a Toro 524 with Tecumseh engine, model 38040 8 0000640. I am rebuilding the carb and would like to know what are basic settings for idle and hi/low speed screws?

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If your bike is still equipped with the stock Keihen CV carb, there is an IDLE mxture screw but it is covered with an anti-tamper plug unless someone has removed it. If the anti-tamper plug has been removed, you turn the screw inward to lean the IDLE mixture, outward to richen the IDLE mixture. This screw only changes the IDLE mixture and has very little effect on the slow or high speed mixture. This mixture is controlled by jets inside the carb.

You didn't tell me why you wanted to know this information. If you are having a problem with the carb idling either too rich or too lean, you probably have something wrong with the carb that a simple turn of a screw is not going to remedy. The Keihen CV is a good carb and functions well when everything is right. I'm still running one on my 1994 FXDWG with over 30K miles on it and never has minute's trouble with it. If you're having a problem tell me what it is and maybe there's a simple solution for it.

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How do you set the carburetor screws on a 1984 60cc yamaha 3 wheeler? There are 2 screws on the carb one is the idle and I assume the other is the high speed setting. I've adjusted them both all the way in...

Half right, one is the idle the other is the air mixture screw, which really only affects idle mixture. The mixture screw is usually about 1.5-2 turns out from screwing it all the way in. then when the bike is idling it is adjusted by screwing it in a little until it bogs down (rich), then screwing it out a little until the engine revs up and down(lean) and finding a smooth engine speed in the middle.
To initially set the idle, look down the carb throat and screw it in until it just starts to lift the slide.
But this doesnt help the starting problem, there may be a blockage in the carb, or if you have cleaned that already, may have to check further, many of those smaller engines need the suction though the standard air cleaner to run properly

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I have a 27499-85 carburetor on a 1979 harley shovel head and am looking for the idle mixture setting-i haven't taken the carburetor off the bike yet, however i removed the air filter and don't see any...

This is not the original carburetor that came on the bike. The orignial was a Kehien "butterfly" carburetor. This carburetor is a later "CV" version with the large square looking top on it.

I'll tell you how to access the idle mixture screw on each model. The "butterfly" carb had it's idle mixture screw in a "tower" on top of the carb just forward of the carburetor mounting flange. The square topped "CV" carb has the idle mixture screw underneath the carb at rear of the float bowl.

They both came from the factory with an "anti-tamper" plug of about 3/16 inch diameter (5mm) pressed in over the adjuster screw so that the owner could not mess with the idle mixture.

To get access to the idle mixture adjustment screw, you must drill a small hole in the "anti-tamper" plug. Be very careful not to drill too deeply or you will damage the brass screw underneath the plug. Drill just enough to go through the plug with a small drill bit. Screw a sheet metal screw or start a tap in the hole. If you use the sheet metal screw, use a pair of pliers or something to pull the plug out. If you're using a tap, once you get the hole tapped screw a screw into the hole and use the pliers to pull the plug out.

If your bike will idle at all, start the bike up and allow the engine to warm up. If it won't idle, screw the idle mixture in until it just barely "bottoms" in the hole. Back it out 1 1/2 turns on the "butterfly" carb and about 3 turns on the "CV" carb and start the engine. Adjust the screw to obtain the highest smoothest idle. Then use the throttle stop screw to set the idle speed of the engine. Once you're finished, put a small dab of RTV sealant in the hole over the screw. If you don't do this, water will seep down by the fine threads permanently seizing the screw making it impossible to adjust the idle mixture in the future.

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