20 Most Recent 1994 Suzuki GSF 400 Bandit Questions & Answers

new plugs and your done

You may have flooded the engine by now, leave the choke off and wind the throttle wide open. Wind the engine over to clear the fuel out. Then turn off, and back on again shut off the throttle. Try to start it without the choke or without opening the throttle. If it doesn't start turn it off and check your air filter make sure it isn't clogged.
Then check your carbs if it has them, slightly tap them on the bowls. Then find the screw on the bottem of the float bowl that lets the fuel out normally an allen head. Unscrew it and allow fuel to run out, then shut it off. Do the same for other carbs. Now try to start it again, if it starts then it was a faulty needle and seat and you might want to look at changing those. If you have a fuel tap make sure it is turned on, make sure you have plenty of fuel in the tank.

Failing that it is a spark issue.

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.

You may find the petrol filter is blocked. That is usually at the top of the petrol tap in the tank. Unscrewing the petrol tap will reveal it.
I always recomend the manufacturers parts as they have more expertise than us!
Fit original carburettors, they were designed for the engine after all.

The problem is with in your spark plugs. Try to replace it with a new spark plug . The same thing happened to my bike and I did the same. When I replace the spark plugs it ran perfectly.

remove carb bowl and clean it and the jets with carb and choke cleaner, put fresh gas in tank to ensure its all good

hi worth while getting the carbs balanced
cheers jay

It seems the charging system of your bike is not working
Recharge the battery and thn fit it in the bike and start it and check the charging rate.
Remember with lights 'on' it drains power from the battery butthe charging system of theengine takes over i.e. if its working alright, with your explanation, its for sure the charging system is not functioning.
Chekc the altenator and the rectifier.

defo need CR8E - they will stand hotter temps.
olny about £7 each

Fuel filter, Valve plugged, Vacuum line from valve to intake leaking or pinched.
Pinched line, Vacuum valve not working (or turned off)

either it is not getting spark or not getting gas

FIX

First check for any fuses etc Make sure lights come on and or horn works

try spraying starting fluid directly into carb wile turning over

If it does not fire then remove spark plug and hold the plug (nut portion) with the lead attached
u aginst side of the engine cylinder and turn over
iif ther is no spark you have an ignition problem

It is either the points(not gaping) or magnito problem

I found that most shops don't stock anything. Try Motorcyclecarbs.com and order them over the internet.

Had a similar thing on mine and it was the leads breaking down. Bought new leads and plug tops. Probably need to go to an independent motorcycle spares shop should be able to help you. Check the plug type - if they are too cold they might be coking up. The higher the number the colder they are. Standard spark plugs are CR8EK. If you have CR9EK they are too cold. It's fiddly and awkward trying to sort out these problems. Otherwise it is a great bike!

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

Sounds simple but believe me. it is nothing but a horror story if attempted. Seek out the professional for this one! Smiles!

I would disconnect the regulator so it does not charge the battery. Now... monitor the battery voltage... try starter, horn, lights, flashers... battery going down ? No fire/smoke/smells ? Re-connect regulator and check again. Regulator should charge battery @ 15volts MAX !!

i had similar problem when i took my battery off and disturbed a wire that is crutial in the circuit when running the bike with sidestand down so check you havent pulled the wires as on mine no neutral light was showing until i found i'd pulled a wire by accident

One coil works #1 and #3 cylinder and the other one works #2 and #4, it could be a bad coil or fouled plugs on the dead cylinders.