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How to adjust carbs i screwed the throttle screw in all the way and lost track how many turns it was now it will not start

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You should have 3 adjustment screws. the one marked T is throttle idle position,adjusts idle speed.Lo adjusts air-fuel mixture at low rpm,HI at high rpm.H & L should be 3/4 to 1 1/2 turns out from a lightly seated position.adjust for best rpm's at Lo,then Hi.turning idle screw in too far would not affect starting,only idle speed.

Posted on Sep 28, 2009

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How many turn it take on the air mixture screw to get my 2010 Kawasaki 360 4x4 to start?


For the initial settings - 03-12
- lightly seat the pilot all the way to the back - lightly, too much torque and you'll ruin the o-ring in there - then back out the pilot screw 1 & 1/2 turns. From there - you let it run for 10 minutes or so and then adjust the idle to 1,300 +/- 50 rpm - turn your handlebars left and right after adjustment of the throttle lever to make sure it's okay and not binding up - and do your adjustment from the throttle stop screw. According to the specs, once you set that pilot at 1,300 +/- the rest of the adjustment is done with the throttle stop screw. If you do all that and it's still not picking up fuel - definitely give the intake/carb boot a good look over for any cracks or anywhere vacuum could escape - and if it still doesn't pick up the fuel - give the throttle set screw a turn or two. Had a 2000 Yamaha XT225 carb I rebuilt a few weeks ago - adjusted everything as instructed - but it wasn't picking up the fuel. I gave the throttle set screw about a 1/3 turn in to put a little nudge on the throttle and it fired right up. All The Best and Good Luck - Justin Lee, 17 South Industries, LLC

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1 Answer

Rough idle, bogs when I give it throttle then dies


Brad:

Go back to the carburetor adjustment screws and snug them down gently. Do not use force on those screws or you'll damage the needle valve seats. Turn both screws out one and a quarter turns out and start the saw. The motor should stay running.... if not adjust the screws until it stays running. Turn one screw in until you hear the motor start to stall, then turn that screw out just a little bit. turn the other screw in until the saw starts to stall, then turn that screw out a little bit. Now if the saw bogs at full throttle, turn one screw out one quarter turn. See if the saw runs at full throttle... if not turn that same screw in to where it was and try the other screw the same way. If you're good, you can adjust the screw while the saw is running to get the best full throttle run. This is not an exact science, and it takes time and many adjustments to get the saw to idle and run at full throttle. Good luck... and have patience.

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1 Answer

What is the adjustment screw under the throttle?


Hi Darren, on the right hand side of the carburator there is an idle adjusting screw with a spring behind it, turn screw clockwise to increase idle counter clockwise to decrease idle. At the front of the carburetor on the bottom of the venturi bore there is also an air/fuel mixture screw inside a carb body lug that may or may not be plugged with an aluminum cap that's about 3/16" thick. This cap can be drilled out to acess the air/fuel mixture screw. Turning screw clockwise will lean out mixture and lower idle, turning screw counter clockwise will richen mixture and raise idle. Start by turning gently the screw clockwise until it just barley bottoms out then back it out 1 3/4 turns. You need to balance the two adjusting screws to obtain an idle of 950-1000 RPM then back out air/fuel mixture screw 1/8 turn, snap throttle to confirm responce, you may continue to back out air/fuel mixture screw untill desired throttle responce is achieved, if you see black smoke coming out of exhaust you have gone to far and need to turn screw back in 1/8 turn at a time, final adjustment should be made with the engine at normal operating temperature. For more information about your question please visit the websites below. Good luck and hace nice day.
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1 Answer

Toro 266d runs five seconds then dies toro dealer just worked on two weeks ago


adjust fuel screw turn it one turn out see if that gets it running if dose turn it slowly in until throttle runs smooth the screw to adjust is the h screw on carb screw mark on top h or body will have a h on it turn it out one turn only but before that try to srart sqiuirt some starting fluid in carb sart engine leave choke off hold throttle wide open should run

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1 Answer

How do i adjust carb?


With the screw all the way in unscrew it 1 and a half turns start it and adjust in or out at full speed to get the best running. Their might be a screw on the throttle for idle speed,

Aug 17, 2012 | Mtd 22" White Outdoor Self Propelled High...

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Craftsman 25cc weedwacker (358.791030). Zama carburator (C1U-W19) Just rebuilt carb but did not adjust low speed/high speed screws. Starts on first pull (with choke lever actuated), and after warm up,...


need to adjust the high sscrew. i do mine in 1/4 turns. start machine, full throttle, adjust the h(high) til it clears up.i would start by turning 1/4 counterclock wise, just remember to keep track, in case it runs worse, the put it back to orig. then try the other way. but i suggest 1/4 turn at a time

example... think of a clock when turning screw. straight up and down, 12oc, 1/4 turn will be 3oc, another 1/4 will be 6oc, and so on. hope it helps!

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1 Answer

Need to adjust my honda shadow 500 vt carburator's fuel/air mixture


start by synchronizing your throttle plates. Honda calls the next step the "idle drop procedure". u need to know if you have fuel adj. screws or air adj. screws. fuel screws will be on engine side of carb slide, air screws will be on airbox side of carb slide. start leaning out mixture, (turn in fuel screw, turn out air screw. idle will increase so keep adjusting idle back to spec.after each turn if needed. Adjust about 1/4 to 1/2 turn at a time on each carb until there is no change in idle, then richen up mixture by one half turn. If u sync throttle plates first then follow this procedure, there should be no hesitation when you "blip" the throttle, and after revving it should return to idle smooth,

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2 Answers

Hyosun Scooter Carb Adjustments


Very good thought process on the adjustments. The throttle screw sets the idle speed and the air screw sets the fuel mix at idle speed. The stock setting is 1.5 turns outward. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward.

From this point you adjust the idle speed then adjust the air screw for fastest idle speed at that throttle screw setting. If the idle speed becomes faster than desired after adjustment, just reset the throttle screw and then reset the air screw.

A “very helpful” rating for this answer? Thanks!

Jun 27, 2009 | 2002 Hyosung Comet 125

1 Answer

Bike won't stay running


Drain the carburetors. There should be a screw on the lower side of each CARB float bowl. Remove the screw then replace it after the fuel drains. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, (not all bikes have a water trap bowl). Install new stock NGK spark plugs.

Remove the CARBS from the bike.
FOR EACH CARB > Remove the float bowl and clean the entire
CARB with a spray CARB cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the CARB. Remove the idle screw and the air screw on the outside throat of the CARB and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
CARB back together, clean the air filter and install the CARB. Install an in-line fuel filter. Let the float bowl fill then start the engine.

BALANCE THE CARBS
Turn the throttle screw on the LEFT CARB one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left CARB to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Now turn the throttle screw on the RIGHT CARB one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right CARB to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both CARBS. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each CARB such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other CARB.

With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other CARB so that the slide on that CARB just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both CARBS begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.

Turn the idle screw on each CARB EXACTLY ONE HALF turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed. Congratulations, you have just balanced and synchronized your CARBS This should fix the problem. One last and VERY IMPORTANT thing, Have a fire extinguisher handy and ready for use any time you work on or with he CARBS.

Please rate this solution. Thanks throttlejock!



Apr 22, 2009 | Suzuki GS 500 F Motorcycles

1 Answer

Honda 1300c backfire through carb at wide open throttle. I have open up the exhust and rejetted the carb . the bike will run fine up to mid throttle or 65 mph but if you accellerate hard or go to wide open...


Try balancing ans syncronising the carbs.
BALANCE THE CARBS
Turn the throttle screw on the LEFT carb one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Now turn the throttle screw on the RIGHT carb one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Turn the idle screw on each carb EXACTLY ONE QUARTER turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed.

SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both carbs. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each carb such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other carb.

With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other carb so that the slide on that carb just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both carbs begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.

Please rate this solution. Thanks!

Mar 30, 2009 | 2004 Honda VTX 1300

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