Engine Not firing, suspected carb issue

I honestly have no idea how to translate that. I cannot get any readings on the coils, but I fired and I actually have blue sparks. I really have no friggin idea and this isnt getting anywhere. I might as well give up.

emptypond wrote: ...........................
battery- 12.7 (probably need a new battery, but I just bought this one 3 days ago)
I couldn't find clear instructions as to how to test the regulator.
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If 12.7 means 12.7 Volts then that's good. With bike ignition switched off the battery should show about 12.3 V and about 12.7 V or so at idle going up to a max of about 14V at 4,000 rpm. If that's the case then your alternator output and regulator should be fine. If you need to troubleshoot the entire charging system then see kzrider.com/filebase/search_result
Regarding testing the coils you can download the 750 shop manual here mbsween.bike-night.com/kz750l3/manual.html courtesy of mbsween a fellow member of KZR

Good luck

yes, 12.7 volts, 12.3 with ignition on

Now start the engine and observe the voltage. You should be around 12.5 to 12.7V at idle. Now slowly rev up the engine and watch the voltage. It should steadily increase to around 14V at around 4000 rpm.

the engine doesn't make it to rev, it dies out before that. The sparks get weaker as I continue to crank 3-4x for 5-10 second intervals. This to me, seems like reason enough that the stator is not good, but I"m not an expert. Any thoughts?

O.K., you have multiple issues here.
First, you say it is a new battery yet voltage drops from 12.7V to 12.3V when you switch on the key.
Second, it should run off the battery for quite a while without a charging system at all, especially a new battery, yet it refuses to rev.
Third, the carbs used to overflow until you took them apart and (I am assuming) you sprayed them out with carb cleaner.
Are all these statements correct?

All these statements are correct. I did have the ignition of for a while when the voltage dropped from 12.7-12.3. Just ignition, no cranking. Opene the carbs, cleaned them, no overflow issue, even when set & left in prime. Timing light DOES work fine, tried it on my other bike, without a problem. So it seems like there is a major drain on the battery when I crank it over , as the sparks go from blue, to yellow and the spark gets weaker as the battery drains. Which would also seem like a charging issue. I've replaced everything electrical except for the regulator and stator.

Oh, the engine does get gas, but does not seem to ignite.

Except on cylinder 2 for a short period of time until the bike stalls out.

While there are tests you can do on your charging system before getting it running. You should get it running first. The charging system is not going to operate while cranking the engine. It needs to be running.

I understand that, which is what my goal is to do... My 1st problem seems to be that I'm not getting enough spark... And I've gone through everything and replaced everything that has to do with spark. I guess I'll bring cart it to a shop, cuz I haven't the slightest idea as to what else to do. Everything seems to be testing out, an everything is brand new, but it doesn't work right

As for your spark issue, the battery should be good if when you charge it, it reads 12.7 after resting.
The voltage Will go down as you have the key On, Crank it etc. Thats normal. If the spark is Blue to start out with on all 4 plugs, and the coils/ plug wires are on right, base/ static timing is close, you have compression, then you need the right air fuel mixture for it to burn.
So I know you have worked on the carbs, but it still may lead back to them as to why it won't run. Will it fire/ run briefly if you add some gas directly to the rear of the carbs, with a sprayer? Just a few squirts.

I tried that with starter fluid, not gas, and got backfire out of the carbs. There was no filters on it when I did that. I will try it with a spray of gas tomorrow. It smelled like gas inside the cylinder 1&4. Maybe it's too rich to fire? My father hasn't put much work into the bike before he passed, but he had had the carbs jetted to 135 mains and the bike didn't seem to run right back then. I just purchased some 120 and 122s from jetsrus. I think starting from a baseline would be the best thing for this. I'll see what I can get done tomorrow.