ehh i might as well tell the whole damn story
i bought the bike 5 years ago as a non runner as a first bike for my gf at the time. i brought it home popped in a new (used) ignitor p/o had opened the original one up and it was just a circiut board sitting under the seat. i was fairly new to bikes at the time so i paid a big shop to rebuild the carbs( which they didnt they just cleaned the passages) and she was running for a few months. at the end of that season i was riding her about 200 miles to my parents house and she was running like crap no power had it pegged the whole time just to stay at 55 and about twenty miles left to go she died out and wouldnt restart.
then school got in the way and she sat at my parents house while i rode my other bikes. for about 2 years. my fiance got interested in learning to ride so i dug it out popped in a new to me still old as crap coils. battery and rebuilt the carbs myself. and balanced them. and she ran for a few months ok but still not perfectly dialed in.
i started hearing some valve tick so i pulled off the head and cleaned the valves replaced the seals and cleaned everything else up with new gaskets. she had last run in november last year ( we bought a house so havent had a whole lot of time to work on her)
thats where im at as far as history
when i was checking for spark last time all seemed to be consitantly weak i will double check this tonight. the coils are pretty bad i was saving for some accel coils to replace them but we are getting married in a month so funds are a bit lacking. the ht wire are a bit loose on some but if the spark is bad across the board then it seems hard for me to accept that all of the plug wires are bad.
also any idea how to test the ignitor the manual specifys a special machine that i doubt anywhere round my small town would have.
i will play around a bit more tonight thanks for all the help
RW
Alright, good background info.
Carbs: Did you take out all the jets and run some wire thru them. New orings? Did you sync up the carbs and set the float height correctly.
Valves: did you check the valve clearances, too tight valves will make you lose power and worse.
Ignition: I'm going to regurgitate some info;
Easiest check is to see if the voltages on the coils are correct. The plus side should have +12V all the time with key on and kill switch activated. If not you have a wiring issue.
The negative sides should go alternatingly up and down +12V and 0.5V as the engine cranks (1-4 and 2-3 are also out of phase). If it doesn't then the ignitor is probably bad.
volt meter on the negative side of the coil, the voltage should go between 12V and 0.5V as your crank over the engine.
If there is no 12V then there is something in the harness, if there is no 0.5V then there is something wrong with the ignitor.
The ignitor will alternate between the two coils.
On a coil ,remove plug caps - measure plug wire to plug wire (stick probes in wires)- should be about 12 kohms. It's tricky to measure over plug cap to plug cap due to corrosion and caps' resistance, but a decent reading might be 24 to 34 kohms.
Taken from
http://www.thegsresources.com/_forum/forumdisplay.php?f=133
If you don't have the service manual for the bike you can find it here for download;
http://carlsalter.com/pdfs/Suzuki_GSF400_Bandit_91-97.pdf
If your coils are bad, cross ref the part number on a parts site and see if they also fit the larger bandits or katanas or gs500's. If so, I may have a spare set of used but working coils you can have. Assuming you are in the states.
ALSO, what Rob said. Check your grounds first. Might as well start with the simple.
