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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1 Answer

1991 Suzuki GSF 400 Bandit #3 cylinder dead


Hi, Justin, you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue. Multi carb banks should be bench "SYNC"
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes, multi-cylinder engines should be within 10-15% of each other if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or its counterpart for integrity.
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.
Mysterious problem with my GSF 400
Bandit running on 3 cylinders
Suzuki GSF 400 BANDIT Service Manual
https://www.partsfish.com/page/oem-parts-for-suzuki
Suzuki GS500 Owner Manual
http://mybikemanuals.com/suzuki

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Dec 20, 2017 | 1991 Suzuki GSF 400 Bandit

1 Answer

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

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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