90 suzuki katana 600 not starting, won't fire at the plugs

Ok, here's one for ya. My '90 katana 600 won't fire. I've checked the
coils and I have the right ohm reading at the plugs and the electrical
connections. When I turn the key on, both sides of the coil read +. I
have switched out the coils and the ignitor box already with new ones.
I checked the signal generator as well. My resistance reading is
166ohms on the leads which according to the book is within specs.
However, when I crank it over, none of the plugs fire. Is there
something I'm missing or doing wrong? It also turns over very slow,
even on different batteries. Don't know if that helps or not but it
only seems to turn at 1/2 the normal start-up rpm. All the other wires
seem to test out okay. I've gone through the electrical schematics
with a fine tooth brush and it looks like everything is wired up
properly. Are both ends of the coil (not the plug ends) suppose to be
hot all the time except for when it fires? How does the signal
generator work? Does it ground itself out to create the fire signal to
the ignitor?
Please help me!!! All I want to do is ride!!!
Jason

 

If there's an electronic tach, that makes an easy test. The tach is
likely driven by that same pulsed ground. If the ignitor box is being
driven, the tach should show RPMs when you crank. If there's no
trigger or the box is bad, the tach needle would stay flat. Not
familiar
with this particular bike, but definitely look at the tach.

If you pull the plugs and ground them, that'll get rid of most of the
starter load and you ought to see a spark if there's one to be had.
Make sure the plug bodies are grounded so you don't have high
voltages looking for a path to ground.

Bump starting is an OK test if you've got friends to help you. Alone,
I wouldn't bother.

You also checked the plug wires I assume.

If it keeps on cranking, I wouldn't worry too much about the battery.

I missed a ride last saturday because of a really dumb problem.
After farting around with the ignition system for an hour or so,
I finally noticed a broken throttle return spring that was keeping
the throttle wide open when I rolled off at the twistgrip. I replaced
the broken spring and it immediately started.

DOH !!!