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Discussion Starter #1
Only had the gen 1 Z1000 for a few weeks now but I ride 500km a week to and from work and i have noticed something.
On the way to work I travel inner city then highway..... no problems.
Going home is opposite.
Temps go up and down. Fans kick in fine and temps go back down.
As I get near home the ignition seems to play up and starts stuttering.
Cools down and is fine again.
Today it was warmer and traffic was heavier.
Stuttering down into dying.
If I hold the throttle on enough to keep running it would go up and down.
I am thinking it is possibly coil breaking down under prolonged heat.

Any thoughts?
 

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It could be a cracked coil indeed. Had a similar symptons on a ER-6N once. Had to kerp the throttle open, to keep it running.

Throttle off and the engine died due to misfires. Worth looking into. Havent worked on a gen 1 yet, but on a gen 2, coil 2 and 3 are not easy accesable

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Discussion Starter #4
Yeah, I had a similar issue with my ER6. Ended up being the coil packs.
I will also check the fuel lines first as I have seen this can also be an issue.
 

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Agreed, it could be either, hope you sort it soon, and let us know what you find.
Good luck
 

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Discussion Starter #6
Well, the fuel lines are good as well as the filter in the tank. Put new plugs in and have been running on 98 fuel.
Thought it had fixed it but it was just some cooler days.
Temp came back up and after an hour or so it starts again.
Got some coil packs that I know are good left over from my ER6 that I will swap out this weekend.
 

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Discussion Starter #7
Well, that's new.
Replaced the coils and have had a week of no stuttering after an hour's ride.
Today with no warning on the highway i lost everything.
Temp was only 72C.
No hesitation or drop in power. Just lights out.
Stopped, ignition off and on again.
Fired up straight away.
Did a similar thing on the way home. Cut out for a second but then kept going.

This bike is starting to do my head in.
 

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that sucks. I am sorry. days like those are the worst. I knew a guy once that had two flat tires in one day if that makes you feel any better 😝. I’ve had the spark plug cap go bad on bikes and would do that stuttering effect cutting in and out until eventually wouldn’t run. I don’t know if your moto is coil over plug ignition or not but maybe replace the spark plug wires & cap too if you have not already??


...one of those days like this?
85165
 

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Like I said in the other stalling post, if it was an ignition issue the bike would be backfiring significantly from the unburned fuel in the exhaust system. If you're not getting backfiring just hesitation and bucking, it's most probably a fueling issue, not ignition. Fuel pumps are known to act up as temperature fluctuate. I've had an issue where my Husqvarna would not start unless it was under 70*F. I diagnosed it to be the fuel pump by freezing the pump using a can of compressed air turned it upside down at which point the bike started in even 100*F heat. Though the pump on that bike was more accessible than on a Z1000.

Try lifting the fuel tank and aim a heat gun or hair dryer at the fuel pump until the bike cuts out to confirm that the pump is your issue.
 

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Discussion Starter #10
New fuel pump on its way.
Listening to you guys has convinced me that it is most likely the culprit.
Hope this gets sorted soon so I can throw some paint at it.
 

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Discussion Starter #11
Well......that was interesting.
Took the tank off and removed the old pump.
Not original. Looked ok condition, filter clean and clear.
Dismantles the fuel sender unit and found this....
85188



Certainly does not look factory.

Gave it a wriggle then this happened!!!

85189


Someone has done a bodge job using what looks like a speaker cable and **** crimps.
I have a feeling this may be the cause of my problem.
Luckily the new pump kit came with a new plug and wire set.
Soldered the connectors on and back together.
85190


Seeing that it is 11pm here I think I will wait until tomorrow to find out.
I will go for a long ride on the way home to stress test.

Fingers crossed🤞
 

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Lets hope this easy fix, fixes your issues aswell! I'm no expert mechanic, but even i wouldnt have done that of a shitty job like the prevouis guy.

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Discussion Starter #15
Anyone got a match.......

2 days of riding and no difference. Only on the way home. After a bit over an hour it starts again....

Next on the list is the CPU...
Not looking forward to this one.
 

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Discussion Starter #17
Now another problem.....
Same as others seem to suffer.
Only done it twice so far.
Sitting on 110kmh the with no warning total loss of power and ignition. Dash out, all lights out.
Turn the ignition off then on using the key while still moving and back to normal..

Open to any more ideas before I leave it on the train tracks.
 

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Could therr something be wearing out in the ignition lock. Had that on my car before, but never heard it happen on a bike before.

Your Z has so much issues, got to commend you for that... I wouldn't have had the patience to keep up with as long as you did.

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Discussion Starter #19
Tried jiggling ignition, switches, side stands...... nothing.
No error codes or warning lights.
It is getting tiring as this is my only transport for a 500 km commute each week.
I have taken it to the dealer and another mechanic i have used but can't get it to repeat the issues...
Might keep an eye out for a replacement ecu.
I wouldn't think a voltage reg or stator would cause this sort of problems.

Might just rewire it.....
 

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Discussion Starter #20
I'm a very patient person. I've owned Alfa Romeo, land rover, jaguars and Jeeps....

Either patient or insane.
 
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