help guysi got no spark?

i before i took my 1983 xj750 seca apart was starting ok just needed a carb cleaning
well i cleaned the carbs and put them back on the bike and try starting it
and nothing happen
so check fuses ,starter ,switch... ect and everything seemed fine
so i took a spark plug to see if there was spark and nothing at all
all 4 are dead what could cause this ?
and why would this happen since everything was ok before taking it apart .

 

By "nothing happen" do you mean that the starter didn't even turn at all, or do you mean the starter turned the engine but it didn't fire up?

 

i mean it didnt start but started turn fine and battery is fine

 

Did you hear the solenoid click when you pushed the button?

 

no just the starter spin its not a starter problem i took all the 4 spark plugs and checked if they had spark and they dont

 

What else did you have apart while you worked on the carbs? Headlight, Tank off, cover off of pick-up coil, TCI unplugged? Any of these?

Check continuity through your fuses so you know they are good. Could be fuse, could be wires loose or disconnected, coil issue, TCI issue, pick-up issue, plugs, it's going to be one of these.

 

thats what i been thinking i checked coild and everything seem to be pluged in i only removed the gas tank
all fuses seem fine
how do i check if my coils are working properly
and what does a TCI do?its plugs in but how do i know if its bad ?

 

also could it be possible the switch is bad?

 

If you pulled your gas tank you might have unplugged your coils as they are right beneath it. Visually checking fuses usually works but if you have a multimeter (if not you need one and they are cheap) you can check continuity by using the ohm setting-should b 0 resistance.

Checking your coils is done with the same meter, same setting. Primary resistance is checked by putting the leads on the wires in the plastic connector that goes into the coil, secondary is checked by removing the plug caps and checking between each plug wire that goes to one coil, so between 1&4, and 2&3. I don't have the specs for your bike, but they're in your manual or if you don't have one someone on here has your specs.

TCI is a Transistor Controlled Ignition, basically a computer chip controlled ignitor unit. It takes a low-voltage signal from your reluctor and pick-ups inside the front left engine cover and triggers your coils to collapse their magnetic fields which then sends high V to your plugs. To test this unit requires electrical troubleshooting skills that generally a laymen can't do. There are tutorials about how to go about it, but basically you have to go through each component inside the 'black box' and make sure it's in spec. It's rare this is an issue but they can fail; however I would start with the simplier, cheaper, easier things to check first.

Another possibility is your safety circuits. There is a neutral and sidestand swith/relay which could be causing this..

 

will try this also is there a relay that may cause this ?

 

Don't the safety circuits prevent the starter from turning too? they do on my 750E-II... :?

 

As I understand it the starter solenoid is operating as an either/or setup where if the bike in in 'N' then it will receive current, or if the clutch is pulled and side-stand is up then it will receive current--but the TCI won't signal the coil if any of the three are failing. So conceivably you could still get starter action and no spark.

If I misunderstood I need a Wizard to clarify.

 

well there's current going to the solenoid but i dont know if its enough or if its working properly
the safetly switch on the kick stand was by pass and it isnt that i checked it
all fuses seem fine ..
does anyone know whats the specs for the solenoid ?and is it one with the spark plugs?(like do the cable come off?

 

@MercuryMan
you where right man it turn out to be my IC Ignitor Ignition
its not getting ground witch is causing it not to get signal to the coils
its seem like i has already been replaced with a used one
my only concern is my did it burn my IC Ignitor Ignition?

 

Just so I'm clear, when you look at your TCI box from the side the plugs go in, do your wire colours look anything like this picture?



IF that's the same, which of those did you test for ground?

 

yes sir for some reason the ground wire isnt getting ground

 

What bike are we on by the way, just realised the 750 & 900 use different pinouts for the TCI so it's more important to know exact model & year than I initially thought!

Which wire did you test for ground? Some models have the TCI earth as the black wire in the small plug, on others it's the black wire in the large plug...

(the other black wire is either a common or combined "false" ground that runs to the pickups)