Question about 1989 Suzuki GSX 1100 FJ (Katana)

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#1,2 carbs slides won't raise when throttlr is

#1,2 carbs slides won't raise when throttlr is opened

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Tighten the scews that lift the slides . need to remove carbs to access these .

Posted on Aug 08, 2010

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1 Answer

1994 VN 750. Kiehn 34 carbs. Why doesn't rear cylinder work?


Hi, Shane you didn't like my answer yesterday? #1 or #7 take your pick and the usual suspects are:
1. Slide atmosphere vent blocked.
2. Slide binding.
3. Spring binding.
4. Diaphragm cap loose, damaged or leaking.
5. Diaphragm pinched at lip groove.
6. Torn diaphragm.
7. Slide vacuum passage plugged.
8. Enrichner valve open, not sealed or leaking.
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There should be a screw in the carb body turning this in raises the tick over turning out lowers it normally. Check the throttle cable[s] adjuster is set correctly. Also check that the throttle action is free running if the cable is not well lubed this can prevent the carb slide from seating at the proper level inside the carb. Some bike have adjusters on the carb top make sure this is not keeping the slide from seating. If you get somewhere fairly quiet open the throttle about half way and let go you should hear a metallic clink as the slide seats on the stop.

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My 2000 yz 426 motor dies when i put it in 1 geer


The trouble is in the carburator, you have 3 jets, 1 for starting, the other is use at the first 25% of your throttlr handlle and the other is a fuff full throttle jets. so, clean your carb very correctly and dont forget to remouve! the obtruction in your jets :)

Oct 22, 2011 | 2002 Yamaha YZ 426 F

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My bro started messing about with the carb setting screws on his Husky 350 and now the thing won`t start.I tried to set it for him but the limiters aren`t working so I have no idea where the H,L and ide...


run both scrwes all the way in and them back out 2 and 1/2 turns. thats a good starting point. adjust the low while idling and the high with the throttlr wide open.

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My softail doesn't pick up when opening the gas handle. Cleaning the carb didn't help


Remove the air filter cover and the air filter so that you can see into your carb. Start the engine and allow it to warm up a bit. Keep your face a safe distance from the carb and rev the engine moderately. Watch to see if the slide moves up and down. If it does not move, you may have a hole in the vacuum diaphragm that controls the slide and it's not allowing your slide to be raised. If the slide is moving, your main jet is probably clogged. You'll have to remove the float bowl and the jet and clean it out. Check the slow speed jet as well. It's in a hole just to one side of the main jet holder. Also notice whether or not you see a squirt of fuel come out of the brass nozzle just inside of the mouth of the carb. If you do not see the fuel squirt into the carb when you open the throttle, you accellerator pump diaphragm may need to be replaced. It's located under a plate on the bottom of the float bowl.

Good Luck
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Will not idle. Will not start hot or cold without throttle 1/4 open. Once started will rev well but when revs drop it cannot be recovered and it just dies. Needs choke wether hot or cold to start and 1/4...


By your description, it sounds like the pilot jet is plugged in the carb. Remove carb and clean thoroghly with carb cleaner and air, making sure that all jet passages are clear. Make sure that washer and "o" ring are present on fuel mixture screw, if so equipped. Make sure float level is correct.

Nov 02, 2010 | 2000 Cagiva Planet

1 Answer

I have a '80 Suz. gs 550e, which has no power on


Hi,
It sounds like you have a blocked main jet in the #1 carb. Unscrew the bolt at the bottom which is the fuel bowl an see if any fuel comes out. If it don't then your needle on the fuel inlet seat maybe jammed.
You will have to dismantle it and clean it out..Hope this helps, let me know how you get on.

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Apr 06, 2010 | 1980 Suzuki Gs 550 L

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Left bank won't fire at low speed. It is a 2004 790 bonneville triumph.


Chances are the carb slides are out of synchronization. Remove the air filters and look inside the carbs ( with a mirror if need be ). With engine off, crack the throttle and see which slide begins to raise first. Adjust the other carburetors' cable to make the slow carb raise to match the timing of the other carb.
Put in some new spark plus as well.

Aug 19, 2009 | 2004 Triumph Triumph Bonneville

1 Answer

Timing Adjustment issues!


If the bike runs then Top Dead Center (TDC) is not an issue. But to check piston stroke position, Remove the valve cap cover on the intake of the front cylinder. Remove both the spark plugs. Rotate the crank shaft untill the rocker arm starts to move. The piston is now starting down on the intake stroke. Rotate the crank further and the rocker arm moves in the opposite direction. The piston is now going upward on the compression stroke. Look at the marks on the flywheel. Rotate the crank untill the TDC mark lines up with the timing index mark. The front piston is now at TDC.

If your model has carbs then the backfire fix requires you to syncronize and balance the carbs.
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.

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. Congratulations, you have just balanced and synchronized your carbs.

Please rate this solution. Thanks sgtswampdonk!

Apr 02, 2009 | 1999 kawasaki VN 800 Vulcan Classic

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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