Question about 1994 Suzuki GSF 400 Bandit

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Suzuki 400 bandit carb tuning cant get bike running right keeps cutting out have replaced carbs as old rack was knackered

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  • Anonymous Mar 23, 2014

    can I convert the vl125 to twin carbs

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Hi worth while getting the carbs balanced
cheers jay

Posted on Jun 24, 2009

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Take to a garage with a rolling road to check te power out put- i just had my 1992 400 bandit on a rolling road - perfect upto 10rpm then dropping 8hp - running on three cylinders after 10rpm. goingo replace the coil packs.

your problem might not even be with the carbs but with the spark. rolling road can tell you alot about your bike.

Posted on Sep 08, 2009

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My bike turns on when choke cable is engage and 5 minutes of warming disengaging the choke cable the bike shuts off.. Its a 1993 suzuki bandit gsf 400..


You may have a vacuum leak. Your carbs may just need be adjusted and synced. I would not be surprised if the carbs have been out of sync since day one.

Sep 15, 2011 | Suzuki GS 400 E Motorcycles

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
http://mybikemanuals.com/suzuki

May 17, 2017 | 1992 Suzuki GSF 400 Bandit

1 Answer

I have a 1991 suzuki bandit 400cc, i cant get fuel down to the carbs, i have had the tank cleaned, installed a new petcock and had the carbs cleaned, also put all new fuel lines on it, still n fuel, im...


Have you pulled the line from the petcock and checked for fuel when you turn it to on or reserve?
If you have fuel flow then maybe the floats are stuck blocking the fuel from filling the bowls. Tap on the float bowls with the handle of a screwdriver. Also if your carbs have a drain screw on the bowls open them and see if fuel starts to flow.
I don't recall if your bike has one, but I have seen few carbed bikes with electric fuel pumps as well. If yours has one then that is for sure something to check into.

Aug 24, 2011 | 1994 Suzuki GSF 400 Bandit

1 Answer

92 suzuki bandit 400 gs-f, ran but it didn't idle after carb clea


hi buddy on my bike i had this problem when you rev it it will rev down gradually so it changed the jets and ir worked so try this buddy then get back to me give me a good rating

Sep 15, 2009 | 1992 Suzuki GSF 400 Bandit

1 Answer

Suzuki GSF400 Bandit problems with tick over.


as you have replaced carbs you will need to retune for fuel intake also check its getting enough air ie.. air filter has been changed or is clogged

Jun 16, 2009 | 1992 Suzuki GSF 400 Bandit

1 Answer

I have a suzuki bandit 400. i place my gas tank on the motercycle and after it burn the gas it has in the carbs it turns off. then i force gas from an external bottle in the gas tube to the carbs and it...


Check the condition of the petcock (Valve) in the tank, open it up off of the bike. does fuel run out freely? if not take it out of the tank and service it , some have screens to trap debris. these can gum up wth debris and varnish from old gas.

Hope this is of some help.
Ed

May 26, 2009 | 1992 Suzuki GSF 400 Bandit

2 Answers

Will not idle


blocked carbs, get a good fuel system cleaner, if you in USA get Berrymans B12, double the dose and mix in tank. run til hot then leave to stand overnight. also if you can remove the air cleaner to get to carb intake, get spray carb cleaner an chuck a load in there. also check to see if you have a fuel filter inline

Apr 10, 2009 | 1991 Suzuki GSF 400 Bandit

1 Answer

Flodding carbs


sounds like a sticking float in the carb....remove the bowls and check for sticking, bad float, or needle and seat partially open...might be just some dirt in there

Feb 08, 2009 | 1991 Suzuki GSF 400 Bandit

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