1990 KZ1000P,, NO SPARK

Hello,, new member and thanks for having me,, i recently bought a 1990 kz1000p for an old man project,, got it to run on cylinders 1&2 only,,witch is weird when the coils run 1&4,,2&3,,i tested the ignition coils primary and secondary resistance and were in spec,, tested the pickup coils resistance,,in spec,, dont know how to test the ic igniter,, from any wiring diagram ive seen,,thats all there is for spark,,checked all related wires for continuity blk and green from the coils and red/yellow and blue/blk from the pickup coils,, all good ,,checked across each related connector,,good,,so i replaced the igniter,, no spark,, replaced ignition coils,,no spark,, replaced pickup coils and wiring,, still no spark,, with the key on ignition coils have 12 volts.. at the igniter connector the bk and green and red power wire ,,all have 12 volts with a frame ground,,,,,,,, im lost i guess and could use some help,,,, I WOULD BE VERY GRATEFUL FOR ANY HELP,,,,,, THANKS,,,,,, i failed to say,, it has no spark on any cylinder now,,,,, thanks again

It may be a fuel issue. Spray some starting fluid in 3 and 4 carburetors.

I take it the bike was not running when you got it.

Does the starter turn?

Have you load tested the battery? It can show more than 12 volts with no load, then drop to single digits under load. With your meter connected to the battery terminals, not the reading, then turn on the key and press the starter button and note the reading. 

If a carbureted motorcycle sits unridden for more than about six weeks, the carburetors will be clogged up with the remnants of what is sold for fuel these days. They will need to be disassembled and carefully cleaned.

 the fuel problem could be next,, i have completly rebuilt all four carbs but currently i have a spark issue,, the battery is new but i will load test it,,,,,thank you

also,, the safety circut is made up and with the clutch pulled in,, the starter spins the motor fine,,,,,, thanks again

Assuming (I know) the batree is ok, it looks like the problem is in the - side of the circuit. I don’t know how expert you are with electrical stuff,  but  one of our members has written a thorough diagnostic guide you can download here.   kzrider.com/forum/forum-index/faq-wiki/6...-fault-finding-guide

Hopefully Wookie58 or one of the other electrical-wise guys will be along shortly to provide more specific advice.

Put it back to the way it was when cylinders 1 and 2 were firing and we'll diagnose it from there.

id like to take the time to thank everyone going out of your way trying to help me with this project,,im new here and trying explain things and place it in the right place on the forum

i thought about that and for any help ill put it all back and get back with yall,,,,,thank you

If the black and green from the coils to the igniter are showing +12v when cranking then they must be open circuit between the point you are testing and the igniter (this should be a switched ground to cause the coils to spark) check out the "open circuit" section of my guide for diagnostic process.
Are you taking your voltage readings from the back of the connectors with everything plugged in as normal ? - if not the readings won't really mean anything !!

ive never checked the blk and green under start condition,, only key on,,, i absolutely will check that,, i just assumed the pulsing coils through the igniter switched it to ground to flash the coils,,,,,thank you

big tom wrote:

ive never checked the blk and green under start condition,, only key on,,, i absolutely will check that,, i just assumed the pulsing coils through the igniter switched it to ground to flash the coils,,,,,thank you

The coils charge when grounded and spark when the ground is broken (sounds wierd I know)