Z1000H EFI ECU

[MartinRJ]

Does anyone have a fuel ECU for the Z1000H they could bear to sell, or otherwise know of anyone who can diagnose faults/fix 1980's PCBs?

My bike started running rough on warm up, and after a lot of swapping parts a replacement ECU fixed it. I suspect a component has 'gone-off' on the PCB, and it would be great if it could be fixed. Very similar tech to the Lucas/Bosch car systems of the day...

[Al]

Its very similar to the L-Jetronic system produced by Bosch or not as the case may be:

Analog fuel injection. L-Jetronic was often called Air-Flow Controlled (AFC) injection to further separate it from the pressure-controlled D-Jetronic — with the 'L' in its name derived from German: luft, meaning 'air'. In the system, air flow into the engine is measured by a moving vane (indicating engine load) known as the volume air flow sensor (VAF) — referred to in German documentation as the LuftMengenMesser or LMM. L-Jetronic used custom-designed integrated circuits, resulting in a simpler and more reliable engine control unit (ECU) than the D-Jetronic's.[2]

L-Jetronic was used heavily in 1980s-era European cars,[3] as well as BMW K-Series motorcycles. Licensing some of Bosch's L-Jetronic concepts and technologies, Lucas, Hitachi Automotive Products, NipponDenso, and others produced similar fuel injection systems for Asian car manufacturers. L-Jetronic manufactured under license by Japan Electronic Control Systems was fitted to the 1980 Kawasaki Z1000-H1, the world's first production fuel injected motorcycle. Despite physical similarity between L-Jetronic components and those produced under license by other manufacturers, the non-Bosch systems should not be called L-Jetronic, and the parts are usually incompatible.

There is a company on ebay that re-manufacturers the exchange units but it appears that they re-package them which may not be ideal and they also want people to pay for their holiday villa in the Cote d'Azur whilst their at it!
Is it definitely the ECU and not the wiring to it or the multi-plug?

AL

[MartinRJ]

Thanks for that Al - really interesting background, and I take your point about potential costs of ‘re-manufacturers’!
I’m pretty sure it is the ECU. The plug and wiring are in good order and check put reliably with a DVM. Swapping ECU’s on and off confirms that.
Another possibility I’ve seen on the forum is grafting a GPz1100B1 ECU onto the H. But I’d need to do a fair bit of homework before attempting that…

[rpeters]

...Think the B1 has a different plug?...pm me I have some spare ECU's if it help get the H back on the road
Rob

[MartinRJ]

Thanks a lot Rob. Yes - the wiring/plug on the B1 is different. I guess you’d need to buy a B1 loom and hack the plug off, then wire that into the H loom. One of the German guys showed an image of this on the forum. Not sure about compatibility of sensors and the B1 map, but I guess it worked.
I’m on the road with my spare ECU, but just want another spare now as back-up. If my ‘spare’ fails in the future I might drop you a line!

Cheers

[chrisu]

i've got a spare B1 ECU and loom.
As you say it apparently works but i've never tried it. I think Peter Krauss knows someone who has made it works but that could be a false memory (I'm old...)

Hopefully Rob can sort you out.

[MartinRJ]

Thanks Chris. As I mentioned, my bike’s a runner, but I want some back-up in the ECU department in case of a future failure. I’ll make further investigations into the B1 option, and may be in touch again!

[MartinRJ]

Dead right Chris - it was Peter Krauss!

[floydsz1]

I've got, I think 4 of the computer ecu things, they came in a box of bits with an 1100B1i bought that had been converted to carbs. I've no idea if they work or not (probably not) or what model they are actually of. I presume the only way to test them is to fit them to a bike. You're more than welcome to try them and do what you want with them, I'll take some pictures of them at the weekend if you want.

[MartinRJ]

Thanks a lot for the offer! I think I’m going to continue the search for an ‘H’ ECU for now, and also see if I can get my faulty ‘spare’ fixed. If that fails, I may well get back to you and have a go at the conversion! Cheers.

[MartinRJ]

Sorry - I may have missed the point. Do you think one of the ECUs you have could be off an H?!!

[Al]

What are the numbers on the ones you have martin?
With a working and a non working one you could be in a great position to get the broken one repaired.
To that end, and without wishing to complicate the matter, i noticed that some people with original Robert Bosch L-Jetronic ECU's have replaced them with Megasquirt controllers.
Not suggesting you go down that route but it might be a possible source of repair since he builds all his own control and electronic components himself! Just a thought.
Just as an aside; i typed in; ECU Repair into Google and just in my area there must be five or six who claim to be able to do it. These are probably the same people who were Artex applicators in the eighties and website designers in the nineties, block paving executives in the naughties though!!
AL

[floydsz1]

Hi Martin, I'm not sure what they are off, I'll get the numbers off them on Saturday. I'd presume they are from a b1 as that was the bike that they came with, all be it they were in a box of bits. I do know the numbers on them are not all the same.

[MartinRJ]

Cheers guys - thanks for your interest!
Al - I agree - I should be able to track down an outfit that can fix the faulty ECU by copying the good one. In my limited experience of PCB’s, I suspect a capacitor or something has just aged or maybe I have developed a dry joint. I have heard of the Megasquirt systems - I assumed they were based in the US?
Floyd (?) - I’ll take the tail fairing off the bike tomorrow and get the part number off the ECU. Cheers mate.

[Al]

I assumed they were based in the US?

They probably are. If it was and English company it would probably have been called 'Discrete A Squirt'
I was thinking of this guy.
http://www.megasquirtuk.co.uk/aboutus.html

AL