First Cafe Racer Mod! 1983 XJ750 Maxim

You guys are extremely helpful, I’m just trying not to bug you for every single wire I’m not sure about if I have a diagram saying what they are.
I tried finding one online but haven’t had much luck.
It would be cool to make a quick write up to share on here

 

sent you a conversation with wiring diagrams

 

Nice paint job on that tank, it's like a mirror!

 

Thanks! It took a LOT of work, I can see why it’s so expensive to have a professional do it!

 

regarding the under seat "pan" , to house the electrics and battery, heres one I made from ally plate, housed everything I needed ,and more,
including battery isolator , card reader ignition, and tool pouch.

 

looks cool, but you are missing the kitchen sink.

 

Look closer. With the electrics removed it can be used as a kitchen sink

 

For a modern lightweight gauge this is what I use. (ebay of course) Copy of the KOSO GP instrument. Made in China but with the same Japanese parts as the KOSO, I got that info from the guy that has them made. I have one on my 1975 Suzuki T-500 and love it. I have another for my XJ 750 Maxim when I get that far. I'm not a fan of the "Atari" thing.
Cheers, 50gary


motorcycle,KPH,&,MPH,digital,speedometer,yamaha,kawasaki,12,000 rpm

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I’m finally back and I’m working on upgrading the gauge!
The Maxim doesn’t have a fuel meter but I swapped out for an 82 Seca tank that does!
I really want this to work with the gauge I bought!
I chose the Acewell MD-052-253, bought an adapter from Acewell to convert the stock analog speed cable to digital as well!

 

does you. r wiring diagram give a spec on the fuel guage resistance it will work with?
there is an older thread that discusses Yamaha fuel level sensor and its resistance you can measure it easy enough

 

I found the previous owner spliced some ground wires and made it confusing for me why one turn signal has a single hot wire when the other had 2 ground and a hot...

My new LED turn signals need a Ground, is there suppose to be a ground on both sides???

 

Yea, Chacal chimes in with the specs on the fuel gauge sending unit awhile ago.
“HCP683
OEM Fuel Tank SENDING UNIT 5G2-85752-01-00
same as 750J Maxim, but arm has a reverse bend to it
Full = 25 ohms
Empty = 300 ohms
Applications:
XJ750 Seca”

 

http://www.acewell-meter.com/wp-content/uploads/2018/04/ACE-MD52-ENV1-20171123.pdf

looks like they have a switch for low to high or high to low

looks like you want to select the 250 ohm setting

 

Thank you for looking into that!
I didn’t even get to that part but you just saved me a future head scratcher!

 

Anyone have experience upgrading gauges?
Per the instructions I’m curious what would be the ideal way to connect the wires for the gauge.

Ground-that’s easy.
Clock power- what should I generally use to power it, direct connect to battery or splice into something else?
Backlight- similar question but I can probably use the light bulb originally for the tachometer, it’s showing 11 volts at the connector.

The big question:
Switch key- Do I splice this into the wires of the key ignition and should I do it on the key ignition side or the engine side of the connector?

 

1982 XJ750 seca atari delete.

The Maxim wiring is a bit different, but this thread covers that.

Maxim gauges instead of Seca's? I have the answer for you!

 

I’m making progress!
Question about what a wire does...
The speedometer didn’t work when I picked up this bike so I’m not fully aware of its functions.
I marked this plug as “Speedo” and I was pretty much guessing the function of the colors.
There’s only power when the key is turned on.
Black is the Ground.
Blue has 11 volts to it.
White/Green has 7 volts.

What does White/ Green do??


Game plan:
I can probably use the Blue to provide power to the Gauge since it’s dependent on the key, Backlight can come from the Tachometer light bulb, and Clock Power CANT be dependent on the key so I may have to splice that into the battery side of the connector for the key ignition wires. (They’re always live)
So what about this White/Green wire???

 

white green goes to speedo reed sensor for the cancelling unit

runs between cancelling unit and speedo

 

Newb question, what is the cancelling unit and what purpose does it have, can I just cap it off?
I have the speed cable converter to digital that feeds directly to the gauge so I’m guessing the cancelling unit isn’t needed if there is no reed...

 

the cancelling unit turns off the blinkers after time or distance . it is not needed.
the blue wire runs the always on lights