Question about Suzuki GSF 400 Bandit Motorcycles

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I just bought a 92 suzuki bandit 400.I brought home ,cleaned the tank out changed the plugs,changed the oil.It fired right up I took it down the road about a mile with The next day I went to go for a ride .I let it warm up for about 20 min then put it in gear got about 50 feet and it started flooding out.I let it sit for about 15 min it fired right up then as soon as i got about 50 feet it flooded out again.any help would great

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Flooding is due to loss of firing and excessive setting of fuel or choke.
So you need to start all over once again. remove the plugs and check the GAPS, if this is more the plugs may not fire as the fuel may be pumped into to flood. So clean and set gap a little lower than the present. secondly check the fuel settings, if there was an alterations done in your last service. If so reset them back to the normal state.
Finally check the fuel quality , check if there is any more dirt( water) in tank. Also check the firing intensity , check with the plugs before you reset. Pump off the excess flooded fuel before the plug is replaced.

Posted on Mar 28, 2011

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Posted on Jan 02, 2017

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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 own a 93 Suzuki Bandit 400 and I just changed the fluids and everything after it sitting for around a year. It started right up and was running great. During the test drive about 2 or 3 miles down the...


Carb would be the place to start assuming it was running fine before it was stored. Gas can "varnish" in carbs while in storage for long periods of time if a fuel stabilizer wasn't added before storing. Might try some fuel system cleaner before going to the trouble of removing the carb.

Sep 20, 2010 | 1993 Suzuki GSF 400 Bandit

1 Answer

Ive bought a bike (1998 suzuki bandit thats been standing for a few years starts great but needs a good service whats the best way to go about this) im thinking of emptying it of all fluids (petrol and oil...


run some seafoam through the tank to clean up a little of the crud thats bound to be in the lines and carbs, check all the fuel and brake lines, flush the brake fluid both front and rear, change the oil filter, air filter, and spark plugs. get a shop manual and go from there.

Sep 05, 2010 | 1998 Suzuki GSF 600 N 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

I have serviced my 97 600 bandit s. had to


Hello if you had the fuel tank off make sure you did not hook up the vacuum line to the fuel outlet and fuel line to the center fuel petcock vacuum connection

Apr 29, 2010 | 1997 Suzuki GSF 600 S Bandit

1 Answer

I recently bought a suzuki bandit 400 for the mpg. The fuel tank was off and i can't seem to find where the lines go from the valve under the tank.


One hose will go to a vacuum source and the other to the fuel tap. The idea is that fuel will not run until the diaphram in the back of the Petcock is pulled back by vacuum. Prime the engine first and then swap over when the engine fires up.

Feb 11, 2010 | 1991 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

Fairly used suzuki bandit


Hi and welcome to FixYa,

Most used 250s are ridden hard either as a starter bike or forced to max out playing catchup with bigger bikes. But unless abused, they tend to have longer usable life than the bigger ones. Often areas that would need your attention/check would be:
  • condition/level of the engine oil. An oil change would do no harm;
  • brake pads (front & rear);
  • carb and tank condition, A rebuilt/clean is a wise action;
  • sparkplug check/replacement. Note the color/condition of the ends of the plugs;
  • valve check/adjustment;
  • electrical system check which includes battery/terminals, major connectors (high amperage), regulator;
  • chain and sprocket. If adjusted against the stops, might be time for a replacement of the set;
  • fork oil seal.
Even if there are somethings you feel like needing work, the general judge wold be how you like riding the bike. Your body, sense of balance and riding style would dictate which if ever would need priority work/replacement/checking over.

Pls post back result(s). Good luck and Thank you for using FixYa.

Jan 16, 2009 | 1993 Suzuki GSF 250 Bandit

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