Question about 1991 Suzuki GSF 400 Bandit

1 Answer

My 1991 suzuki gsf400 has erratic idling. also is hard to start.

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Guru:

    An expert who has written 7 tips or uploaded 3 video tips

  • Expert
  • 267 Answers

This could be almost anything, probably minor. Good premium unleaded fuel, fresh/clean and gapped plugs, fuel filters clean,. Carbies clean and jets good, correct float levels, no air leaks in intakes, air filter clean, Electrical connections 100%, ignition coils OK, no sign of moisture behind magneto/stator cover or on source/pick-up coils. Engine earth wire secure from head to frame?
So....
New plugs, 0.7mm gap to start with and set air* mixture screw 1.5 turns out.
To flush carby with cleaning solvent (spray can from auto access.) Take float bowls off (check for sediment) and fuel lines off and spray till it pours out of float needle seat, Loosen carby clamps and swivel carbies outwards 90 degrees and unscrew pilot jets and spray thru also. Check operation and smooth return of choke.
* Air mixture screw controls fuel-air mixture at idle speed and is a trial and error thing. Pilot and Main jets regulate cruising and acceleration mixtures and ranges according to rider style and riding and climate conditions.
If there is any undue noise comming from the top of the engine with revs slowly rising from idle to 2000 revs, you may need to check camchain tension and valve clearances, easy done with some simple tools and a manual. Downloadable free with an engine search!
Goodluck and Cheers.

Posted on May 02, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Suzuki jr80 takes too long for rpm to get back down to idle , after throttle is released. wasnt run for couple yrs. completely disassembled carb and cleaned. it starts 1-2kicks.not setting correctly?


Hi, Troy and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
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.
Lazy Slow Return to Idle or Erratically High Idle
2 Stroke suzuki JR80 tuning help
http://www.soemyanandarthetlwin.com/hwa/suzuki/suzuki-jr-80-service-manual.pdf
OEM parts for Suzuki
Suzuki DS80 and JR80 Motorcycle Cyclepedia Online Service Manual
Suzuki JR50 Owner Manual

May 25, 2017 | Suzuki Motorcycles

1 Answer

In what order do the ht leads fit to the plugs?


If you go to the following web site, it will give you a diagram of your coils and HT leads and a good idea of how they fit.
http://www.cmsnl.com/suzuki-gsf400-bandit-1991-1993-usa_model16065/partslist/92023.html

Jul 06, 2015 | 1991 Suzuki GSF 250 Bandit

1 Answer

How can I tell Which Year My GSF 400K is?


Everything you want to know about the bike can be found in the VIN number (letter). In this case pay attention to the 10th digit (reading left to right). This may help too: http://www.suzukicycles.org/Bandit-series/GSF400-Bandit.shtml
Good hunting....

Jan 10, 2015 | 1991 Suzuki GSF 400 Bandit

1 Answer

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.
http://forums.banditalley.net/suzuki-bandit-250-400/bandit-wont-idle-lags-1991-400cc
1991 gsf 400 suzuki bandit ignition and idle fixed
Suzuki GSF 400 BANDIT Service Manual
OEM parts for Suzuki
http://mybikemanuals.com/suzuki/suzuki-gs-owners-manuals

Oct 14, 2017 | 1991 Suzuki GSF 400 Bandit

1 Answer

My suzuki will start and run but it will not idle and when it idles it dies out drained my fuel tank and replaced the plugs its a 1991 gxs1100f


test the coil pack with an ohmmeter for resistance
you will need the spec it would test out at - call your local dealer
Best regards
Ck

Aug 18, 2011 | 1991 Suzuki GSX 1100 FL (Katana)

1 Answer

I need to know were i can buy carbs for my 91


Have you tried your local motorcycle wreckers/recyclers first, eBay motorcycle parts site or www.wemoto.com in UK, www.suzukicycles.com in USA or www.bikebandit.com to start?

Apr 13, 2010 | 1991 Suzuki GSF 400 Bandit

1 Answer

My honda idles very high and low and erratic when iac disconnect


You need to have the throttle adjusted and since this will involve adjusting the air to fuel mixture you will most likely need a mechanic with a computer bench to do the work. Should cost around $40 to $50.

Sep 08, 2009 | 2000 Volkswagen GTI

1 Answer

Techometer Gauge reading erratic above idling


take the dash out and make sure all the grounds are in good condition and also the grounds around the distributor

Jun 15, 2009 | 1991 Honda Civic

1 Answer

Erratic idle


You need to check for a trouble code, Kragen auto does this for free. Also check for vacuum leaks at the intake manifold.

Nov 15, 2008 | 1991 Plymouth Laser

Not finding what you are looking for?
1991 Suzuki GSF 400 Bandit Logo

914 people viewed this question

Ask a Question

Usually answered in minutes!

Top Suzuki Experts

yadayada
yadayada

Level 3 Expert

77499 Answers

Arnie Burke
Arnie Burke

Level 3 Expert

4536 Answers

Richard
Richard

Level 2 Expert

83 Answers

Are you a Suzuki Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...