Question about 1992 kawasaki VN 750 Vulcan

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Carb adjustments? How do I make adjustments on the carb?

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There are two screws on the carb itself. Those are what you adjust by small turns at a time to get your high side and your low(idle) side. Small flat screwdriver is what you need to use in most cases.

Posted on Apr 13, 2014


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4carberator adjustnent for 83seco 650

Carbs are mostly "locked up", no adjustments other than idle, and for "syncing". To adjust idle there a screw up on the linkage where the cable attaches, and a bellcrank that moves all 4 carbs together, it's up and forward of the carbs on the top, just under your fuel tank. It's a little hard but not impossible to adjust with the tank on.
The only other adjustments are idle air fuel on some models, a brass colored screw on the side of each carb. These should all be 1 1/2 turns, adjusting them any where else isn't gonna change much.
"syncing" the carbs involves being sure the slides inside are all the same height, this doesn't change much. It requires eithe a nanometer or vacuum gauge made for bikes, or the carbs coming off and physically measuring each slide and adjusting them.

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I do not have a tool to fit the needle valves (2) on this carb.? Is there a generic?

I am going to assume you want to adjust the carb. The manufactures make it difficult for you to do this because:
The carbs are preset from the factory to give the best performance and best EPA (emissions)
You can get carb adjusting tools from amazon and other sources. Just do a search for that term.
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A good cleaning is probably all you need and adjusting the carb will make matters worse.

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1 Answer


Most carbs have the adjustment removed (EPA) but if yours still has the adjusting screws here are the seat of the pants methods:

One Screw Carb: Turn it all the way in and then back out 3-1/2 turns, start the engine and make slight turns in or out until the motor runs smooth from idle to wide open, do not get it too lean, turn in until max RPM is reached then turn out 1/8 turn and go from there.

Two Screw Carb: You adjust the one to remedy either the low or high, high is adjusted until the motor runs smoothly under load at high RPM and the low is adjusted until idle and off idle is smooth.

Feb 27, 2010 | Troy Bilt Tb70ss Gas Trimmer

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Carb needs adjustment running rough and shaking

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1 Answer

Whats the best and easiest way to set the carbs on a 1990 yamaha radian yx600

Your problem is probably the sycronizing as long as you havent messed with the fuel screw or jetting. If you dont have a set of vacuum guages you can eyeball the slides in the carbs to at least get you by and you can usually get them pretty close. Find the carb that is directly linked to the cable. the other carbs are adjustable to that carb so you need to make all the other carbs identical to that one. Look at the gap from the bottom of the slide to the bottom of the bore of the carb on that base carb with the throttle at idle bike not running. With the adjustments on the linkage to the other carbs adjust the other slides to the same height as that base carb as close as you can. Measure if possible to get all the carbs as close as possible to each other. you may have to adjust the idle after. If the adjustments on the carbs are all cables, for example there is a cable to each carb directly connected to the slide just adjust each cable accordingly and achieve the same as above. make sure you have a little freeplay at the throttle when you are done. you can adjust that by the cable adjustment by the throttle which will keep all the carbs in sync

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Idle adjustment

If there is not a screw on the side of the carb then look at the top of the carb where the throttle cable connects. The fitting at the top of the carb is threaded and would adjust the carb idle. There may be a similer adjustment at the twist grip but I don't remember one there.

Hope you can rate this solution as a 'FixYa'

Mar 20, 2009 | 2005 Suzuki RM-Z 250

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