TOPIC:

Your battery and starter are (stong) good. If you look closer to your second Video you can see a blow by smoke coming out of the bottom
of the #4 intake boot (mis-firing) @ 0.18 sec.
Have you check your ignition Timing?

As Scirocco said, the cranking speed and vigor seem really good. Keep trickle charging the battery to keep it topped up.

If it doesn't start from the amount of cranking in the videos, then there is definitely something else wrong. It could just be no fuel. You should be on prime. The heinous sound is just backlash in the primary chain due to irregular firing. It sounds almost like it is only running on two cylinders... and not good at all on those two.

Like Scirocco said, I would be looking at electrical issues first since you did so much electrical work.

Take out all four plugs and look for spark. Also check timing while the plugs are out with a timing light. That will show if the timing is at the wrong time, even if the bike is not running and just cranking. Don't crank for more than a few seconds, and let it sit to cool down for several minutes after each try.

When checking for spark make sure all four plugs are on the engine so there is an electrical path for every spark to the engine otherwise you will damage the igniter or the coils. With all four plugs out it will be a lot less stressful on the starter and battery.

I'll start with spark, Is it fine to use the painted engine part for a path? gpz engine paint seems pretty thick.

Ignition timing im not very keen on, but ill do my research.

Also is there any harm in putting a drop of oil in each cyl while i have the plugs out?

So, took out all spark plugs re gaped them (which they re fairly new, so im not too worried about them) and check them all for spark.

they all make spark, and i put a drop of oil in each cyl to sit over night.

I'll try to start it tomorrow morning, after that i guess im checking the ignition timing.

Does ignition timing just come out of position like that? It was previously running great. But i guess there is no harm in checking it, i'll have to buy one of those strobe timing tools

Also the primary chain, making the backlash again, could it cause any major harm?

No luck this morning, let prime flow gas, and starter just span with nothing happening.

it is a bit cold, and the bike has been sitting for a month.

it is a bit tedious, because i dont have access to an outlet. so I have to uninstall my battery and walk back up to my apartment to charge it.

I'm glad I got my initial issue solved, but man this is just one thing after another.


I didnt realize I had electronic ignition, i assumed it was points because I have been using a z550 manual :l

how exactly do you set electronic ignition on a non running bike?

Also does the orientation of the leads on the ignition coils matter? im pretty sure I have them on correctly but curious about that.

One common issue is getting the the firing order 180 degrees out. This can happen when swapping wires or re-assembling the ignition advancer. The rotor can go on backward.

Make sure the right coil has a black wire and it fires cyl 1 and 4.
The left coil gets a green wire and fires cyl 2 and 3.

Then make sure the point of the rotor points toward the "Tec" logo when the engine is at TDC for 1 and 4.

Normally when the ignition is 180 out, nothing happens at all. But in some instances, the ignition can have a ghost spark that is also 180 out. This is a very weak spark , but could be enough to run a cylinder or two for second.

Ill check that. is the T next to the 1•4 not TDC for those?

I did re confirm that the coils leads are in the correct spots.

I was able to get it running for a second two separate times, so I think it wants to run.

i pulled the plugs again and the valves seem to be operating fine. tried at bump starting but my driveway space isnt long enough.

hope im not wearing out my battery too much. how many crank should I pull the battery and recharge it? I've been pulling it once it goes under 12.5 volts to be safe...

managed to get the almost running state on clip,
Is it possible for the gas to have gone bad within a month?
It's 91, octane. at this point i might pull the carbs off anyways to replace the boots, (I have new boots ready to go)

althought the fuel in the fuel filter looks fine, and flows good.

So I've flooded my engine, I was going to replace the plugs and try again. but realized I should probably give time for the chambers to clear out and maybe try again tomorrow.

Should I just replace the plugs? even worth trying to clean up? luckily I have a spare set.

before


after


no luck today, maybe tomorrow will be a better day.

Well, definitely getting some amount of fuel.

Have you checked the spark timing with the wire colors and rotor position etc?
That still wasn't enough running to convince me the timing is spot on.

Are you giving any throttle while cranking. Sometimes you have to do that a bit.
I assume you are starting with choke, and all 4 choke flaps are intact.

So using the spark plug hole as reference, when the first cyl (far left) is at the top of the stroke, the rotor (I also assume you mean the little tick above the plate that spins)


indicator will be at the T which I assume that's correct but at the same time doesn't aline with what you said.

when the indicator is pointed at the TEC logo, the intake valve is open, hard to see how far the piston is on the stroke tho.

does this seem correct?

I've been on and off attempting all day, various throttle positions. manual says to be all the way open for when it is flooded, so I'll try that tomorrow.

I'm seeing the same puff of mist Scirocco saw. this time In the 2nd day 2nd attempt vid. It looks like it's coming form #4 intake boot. Could the "lock up" be hydrolock? Maybe too much fuel?