Question about 1991 Suzuki GSF 400 Bandit

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My 1991 suzuki gsf 400 after the engine warms up and you turn the throttle it's idle stays high and wount come down unless i let out on the clutch. It will not idel eather

When I first start it up it idels ok then ounc it warms up it will not idel. when i turn the throttle it reves up but will not come down. If i let out on the clutch it will come down. it also misses or sputters when i stop and have to crank the gas real high let out on clutch acouple of times to get going

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  • 168 Answers

It maybe sucking air around intake boots

Posted on Jul 12, 2017


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Posted on Jan 02, 2017

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SOURCE: GSX 600F idle and throttle probs

hi m8,, just a couple things,, wen u stripped the carbs down and cleaned them,, did u take the main jets and cold start jets,ie the jet that the needle in the carb sits in,, and poke the dirt out with a pin,, so u can see threw all the holes wen held to the light, u have a blockage still in the carbs,, undo bottoms of carbs take the main jet and the needle jet out ,,and clean ,, make sure your airbox is sealed down on the carbs and jubilee clips are tight,,,1 at a time pull off the spark plug cap and pull off the cap from its ht wire and snip a little bit off the end so u can see copper or brass stranded wire then screw cap back on ,do that to all 4 caps, do these checks ,the bike will run good, ,, look more in2 the carbs tho ,, its almost certain u have a bloked jet still

Posted on Jan 27, 2009

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SOURCE: I need tuning specs for my 1982 suzuki gs 750.

You need to fix the fueling first - without fuel it won't run!
Your other problem sounds like an air leak - either the manifold or the carb. Check by spraying WD-40 or CRC at the manifold and carb join while the bike is running - if the revs change (either up or down) you have a leak.

Posted on Jun 29, 2009

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SOURCE: drz 400 sm starts but i cant give it any gas or it dies

Can you slowly increase the revs? It sounds like an accelerator pump or debris in the carb.

Posted on Jul 31, 2009

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SOURCE: 2006 Suzuki Boulevard C50 engine dies

Even though you probably don't have that many miles on the bike, or if you do have a lot riding time on it, it sounds to me like you need a valve adjustment. That's a high reving bike for that engine that works pretty hard so you might have 1 - 3 loose valves.

Posted on Dec 10, 2009

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SOURCE: change fuel filter on 2002 suzuki intruder volucia 800 vl

i have a 2002 volusia intruder 800cc and the bike was runnning fine. i change the oil/oil filter/removed the radiator hose and drain the radiator/ replace spark plugs and when it was time to start the bike it started and then stalled out/ can't keep the bike running. check the fuel filter and it appears to be o.k. don't know whether or not i should change the fuel pump???

Posted on Apr 06, 2010

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1990 Suzuki GSF 400 Bandit will not idle

Hi, Anonymous check your idle circuit passages for contamination also you need to make sure you have no intake leaks by spraying some Brake Kleen, Contact Cleaner, Starting Fluid etc. around the intake manifold and seals, if the RPM's go up or down significantly then you have a leak that needs to be fixed before you can continue with the carburetor adjustment.
The engine should be at operating temperature with the choke off to set the idle between 950-1050 rpm. Turn the idle skrew clockwise to increase the idle speed and counterclockwise to decrease the idle speed. If you have access to your air-fuel mixture skrew you may turn it as well, if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air-fuel mixture skrew clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back the skrew out 1-1/2 full turns to establish a starting point start the engine and check the idle rpm's and turn the idle skrew accordingly for 950-1050 rpm if necessary, turn the air-fuel mixture skrew 1/4 turn at a time and let the engine settle for about 10 seconds, turn the skrew clockwise for a leaner mixture and counterclockwise for a richer mixture, you are seeking the highest rpm your air-fuel mixture skrew can acquire without going past 3 full turns from bottom then resetting the idle skrew back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture skrew all the way in then your pilot/low-speed jet is too big and needs to be replaced with the next size smaller. Final adjustment should be made with a clean air filter mounted to the carburetor.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
1991 gsf 400 suzuki bandit ignition and idle fixed
Suzuki GSF 400 BANDIT Service Manual
OEM parts for Suzuki

Oct 14, 2017 | 1991 Suzuki GSF 400 Bandit

1 Answer

1992 Suzuki GSF 400 Bandit carburetor jetting

Hi, Crazystang79 if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Carb Rebuilding Needle Jets Jet Needles etc
Carburator Theory and Tuning
Suzuki GSF 400 BANDIT Service Manual
OEM parts for Suzuki

May 17, 2017 | 1992 Suzuki GSF 400 Bandit

1 Answer

The bike will not take throttle, refuses actually, carbs are clean and in sync, Bike idles perfectly, but when any throttle is given, the engine is restricted to 2k rpms. Stock jetting, and a slip on pipe.

i think the fuel filter inside the tank is dirty, or the fuel on the float bowl of the carb is low that when you give gas the fuel in the bowl runs out.

Aug 19, 2010 | 1991 Suzuki GSF 400 Bandit

1 Answer

Idle problems

remove carb bowl and clean it and the jets with carb and choke cleaner, put fresh gas in tank to ensure its all good

Jun 15, 2010 | 1994 Suzuki GSF 400 Bandit

1 Answer

Hello! I have a suzuki gsf 400 bandit 1992, and not much is at idle. It is very difficult tureaza but at idle, and when you get there does not really sit at idle.

have you cleaned and syncronized your carbs lately ?sounds like they could be in need of some rebuilding or maybe just a good cleaning

May 01, 2010 | 1991 Suzuki GSF 400 Bandit

1 Answer

1990 GSF 400 clutch feels like a dead lever, help!

when you say dead clutch but you are able to reide throught the gearsis that to say you are reving it up & dumping it into gear without the clutch are you doing this with the bike on the centre stand or on the road or are you selecting the gear & the bike stalls when the clutch is released if you have put high detergent motor oil intended for use in cars you can bet therin lys you problem. Let me know how you get on Regards Geoff

Apr 30, 2010 | 1991 Suzuki GSF 400 Bandit

1 Answer

Engine oil went low , clutch difficult to engage

The clutch got cooked, so it does need to be replaced, unfortunately.


Sep 15, 2009 | 1991 Suzuki GSF 400 Bandit

2 Answers

Wont keep running

Maybe some water in an electrical plug. Remove the tank and dry it all out with compressed air or WD40. Work around the coils and other wiring. Also where the wires come out of the engine case.

Jun 15, 2009 | 1991 Suzuki GSF 400 Bandit

1 Answer

High idle

hello mate,, b4 i can give u any advice,, u need to get the carbs balanced and syncro,,if u dont have carb balancers then itl cost yuh bout 20 quid to get them done in a garage,, sounds to me as if that is the prob,,to give u irratic idles,,

Mar 24, 2009 | 1991 Yamaha FZR 1000

1 Answer

Gsf 400 bandit clutch needs replacing how do i do it?

Real easy, just drain oil, take off side case and remove the bolts.
Take it off as an assembly.
Make sure clutch plates and friction plates are positioned correctly.

Are you sure you need to replace the clutch?
I assume it merely needs a minor adjustment.

Feb 17, 2009 | 1991 Suzuki GSF 400 Bandit

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