20 Most Recent 1997 Suzuki GSF 1200 Bandit S Questions & Answers

Hello, bike not running off of choke is an indication that the pilot circuit in the carbs is plugged.. the choke is a enriching circuit hence why it runs only with the choke on. When turned off the bike starves for fuel and dies. My guess is the bike has sat for longer than 4 months and the pilot jets are plugged from varnish... they will need to be removed and properly cleaned.

I am not particularly familiar with any "91 Bandit 400,"but I can figure out something that simple, sight unseen! Does the bike have ignition points and an ignition coil, or do you know? Secondly, does the headlight automatically come on when you crank it? With correct answers, we can get to the bottom of this issue quickly!

you don't need a firing order...left coil runs 1 and 4...right coil runs 2 and 3...it's called a wasted spark system...each coil fires 2 cylinders together but only one will be on it's combustion stroke at the time.

When a engine is cold the revs should be higher ( choke on ) but nit going up and down. If you release the accelerator and the engine still rev's up maybe the accelerator cables are not properly installed on the carbs. Also a air leak is possible. Check the cables and air leaks at manifold including the holes from manifold where vacuum gauges should insert when carb calibration is necessary. Those holes should have some caps on.

Anything inside the engine casing will have some oil on it. This includes the ignition pick up coil. But it should not be drowning in it.

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You might have a vacuum leak. With the engine running, spray carb cleaner in very short spurts around the vacuum lines and carb boots. When the engine speeds up, you found the leak.

NGK DR9EIX iridium or NGK JR9B standard

Over time, some synthetic lubricants can shrink the cork on the friction plates. When this happens the problem you described comes about. The fix is new friction plates and standard 20w50 motor oil in the gearbox.

Try buying new diaframs for your carbs, because of the diafram and piston operation, if the diafram becomes weak due to heat from your engine, and by the diafram not beeing rigid enough, it hesitates to lift the needle out of the jet causing the lack of fuel at low tack/rpm when throttling up or accelerating slowly.

- Take the seat off.
- Unscrew the two bolts holding the back of the tank.
- Remove (unscrew) the petcock handle.
- Lift the back of the tank. I'm not sure the air filter can be accessed without removing the whole tank. If you have to remove it, it just slides back and up - there are no screws in the front of the tank. Pay attention not to disconnect the hoses/wires if you are just lifting the tank, or disconnect them all if you have to take the tank off.
- Unscrew and remove the battery cover if necessary.
- Unscrew the airbox cover (two screws in top corners).
- Pull the airbox cover back and remove it. It's held at the lower end by two plastic "teeth" - no screws.
- Remove the old filter and put in the new one.
- Put everything back in reverse order.

Refer to the microfiche above for parts layout. This is a simple procedure that shouldn't take more than 30 minutes even with tank removal.

one coil feeds 1&4 the other coil feeds 2&3

it is probably cheaper to have a locksmith remove the broken key and cut you a new one

You have a vacuum operated fuel tap. It should have 'on' , 'res' and 'prime'.
In the prime position fuel will always flow from the tank. In the other positions the engine must be running to allow fuel to flow. If the bike has been standing for a few days, fuel will evaporate from the carbs and the bike can be difficult to start. By switching to prime for a minute, the carbs are replenished and starting should be easy. Dont forget to return the tap to on or reserve once started.

so long as you can hold a spaner and have half a brain you can do this job easly the hard part is getting the clutch back in the clutch springs are quite hard to fit in, but yes you can do it ok

try changing the fuel.

A chance of plugs may solve this problem or a new air cleaner .