Yamaha XJ750-D Fuel Injection (Model 22N)

I bought XJ750D from my friend without the original digital dash board. Now I can get the original dash board to replace. But the problem is How can I make the speedometer working because I don't know how to connect the wiring. Pls help.

 

This is the new dash doard.

 

That is a funky space-age dash. It's an absolute wonder that you were able to find a used one.

Speedometers (and on some models) tachometers are typically cable driven. If not, then you MUST find a wiring diagram for the bike. Since these bikes were rarely exported outside of Japan, that is where I would start my search, perhaps eBay Japan, etc.

 

P.S. Dave Fox (user name "hogfiddles" on this forum) has the manuals, so he may be the best person to contact:

https://www.xjbikes.com/forums/threads/unobtanium.110007/#post-557924

 

Yamaha used the same electronic speedo that was used on the first-generation Virago.
The speedometer cable attaches to the threaded fitting on the back of the dash center.

 

I just want to know which wire is sending signal to speedometer. In the back of the dash board it have the threaded for connecting with speedometer cable but it use for odometer only.

 

On the Virago unit, the speedometer gets its signal from the speedometer cable, just as the odometer does. The pickup for the signal is inside the speedometer housing, and it relies on a magnet that is part of the mechanical input. As the magnet spins the circuit counts the revolutions and that drives the display.
If that unit works differently (I suspect it does not) then I can't be of much help.

If it works differently, then the speedometer would have to be getting its signal from a hall-effect sensor; either on the front wheel, or in the transmission. Look for that and you should be able to trace the wires from there.

 

Looks like a cable to me. At the bottom, just to the left of the Y in Yamaha.

 

Your info is really help me a lot. Big thanks for help. I will checkd ASAP

 

Already contact to Dave Fox. He already send me the wiring diagram. Dave Fox is very kindness man. Thanks you for your good support.

 

Yes he is!

 

Your correct that the pickup for the signal is inside the speedometer housing, Now my speedometer is working. Thanks you for your big help.

 

I'm so glad that I was able to be helpful. I'm also a bit envious that you have an FI XJ. Please keep us all up-to-date on your restoration progress in this thread.

 

Hey Kyle, just want to ask for some clarification here: so even though this is a cable driven unit, it does not work in the same manner as standard XJ-series speedo's work (a spinning magnetic bell "winds" the needle into the proper position)? This version uses something akin to the self-canceller reed switch to "count" the number of rotations via the computer in the dash?

 

That I'm not sure of. I've never taken a Yamaha digital display version apart. My suspicion is that there is a hall-effect sensor on the circuit board that counts the revolutions, but a reed switch is another possibility (and likely given the cost effectiveness of sharing parts across models).
I think that info is probably available on viragotechforums.com if it's anywhere.

I might have a spare CYCOM from the Virago in a box, and if I find it I'd be willing to peek inside. Finding it will be the trick though. I still haven't found my pint glasses, and we unpacked all the glassware boxes that we could find after the move.

 

Work on this issue first, prioritize man!

 

My fuel pump is not working I looking to replace.
I try to find out the XJ750D Fuel pump specification. It no have any information about it.
The original fuel pump is Hitachi FPM-01. And someone had replace by Airtex EP6910 EFI. Both pump no have spec in the website. Do anyone have information about the Flow rate and Pressure of the fuel pump?
Or pls advise which fuel pump is match for XJ750D (Injection)?

Thanks you for your help
Karanpon

 

In-tank or external? Maybe check what's used on the GPz 1100 or GPz 750 Turbo.

Photos might help.

Are you sure it's dead?

Is there a fuel pressure regulator on the fuel rail, or is the system single-ended?

 

This pump is external. Pls see the Pump and injection system as attach photo.

 

The factory service manual should (may) have the specifications for the pump.....either in the fuel section of the manual, or, in the rear of the manual, where quite a few major components have detailed specifications outlined. Again, try contacting Dave Fox, since he has the manual.

Sometime fuel pumps can be brought back to life by soaking overnight (24 hours) in a tube of kerosene, that will loosen any internal seizure that may have occurred from dried gas.

 

And keep reversing the polarity of the power leads to get it to rock back & forth

 

OK, so, it's a return type system.

Something like this GSXR600 pump may work. https://www.ebay.com/itm/293116734163?hash=item443f1e6ad3:g:T~gAAOSwafZc~HCr

Should be sufficient for the flow, and that system is also a full circuit setup.

 

I believe the pump puts out around 20 psi, I ended up getting a replacement pump that put out 40 psi and it seams to work just fine with the factory fuel pressure regulators (I believe are 36 psi).
Had to get adapters for both ends and new fuel line.