1980 Yamaha XS650 wiring and ground (-)

How go i ground the starter motor

  • Frame

    Votes: 1 25.0%

  • Motor

    Votes: 3 75.0%
  • Total voters
    4
When does a 1980 xs650 become a 1979 xs650 with a TCI setup?
Probably when the wrecker looks at the manufacturing date on the neck and it states "manufactured 11-79"

I'll go out on a limb and say that sure looks like a TCI control box.......lol
Guarantee that it will work? Only know by trying it. I'd be inclined to find one from a forum member that has tested one as good.
 
Last edited:
Yes it will work... that is it will fit your bike. As to whether or not it actually works... :umm:
As 5T said, 80 was the first year of the TCI system, so that box is an 80 or newer
 
nj1639 said:
When is a 1979 xs650 a TCI setup?
Probably when the wrecker looks at the manufacturing date on the neck and it states "manufactured 11-79"

I'll go out on a limb and say that sure looks like a TCI control box.......lol
Guarantee that it will work? Only know by trying it. I'd be inclined to find one from a forum member that has tested one as good.
Click to expand...
It broke cause I’m a freggin idiot. I
Mounted it In a area that didn’t have much clearance from the back tire. And like a dummy I risked it and still mounted it there. Finally got my carbs to
Stop leaking and went for alittle ride. While
Jumping off a curb the bike backfired hard. Still running tho. Got it home and literally had the box tic box in a million pieces. Plastic everywhere So even tho the add says it’s from a 1979. Should I give it a go. Also it’s guaranteed to work or full refund
 
Dxs650 said:
Jumping off a curb the bike backfired hard. Still running tho. Got it home and literally had the box tic box in a million pieces.
Click to expand...
So it still ran the bike? If so there's lots of cheaper options... such as an electronics project box. Have a look here. Less than 10 bucks and your back in business.
 
On placing the TCI box in places where it wasn't originally mounted........I've placed them under the stock seat and currently run my converted '77 mounted to the left side of the battery box. The stock air boxes have been removed for Uni foams and there's a nice little threaded receiver left to attach one of the TCI mounting ears to with a bolt and washer. Sidecovers fit as normal. 2K miles on so far, no prob.
 
Alright D, if the bike got you home then the components are still working though the box is shot. I'll say that running a TCI its good to have a working spare.
If it's guaranteed to work with money back then go for it. Keep your busted one as a backup, you can swap the guts out if need be.......other opinions may vary.
 
E3ECE0BD-E9BB-4404-8F32-3249EEAD8F54.jpeg
nj1639 said:
On placing the TCI box in places where it wasn't originally mounted........I've placed them under the stock seat and currently run my converted '77 mounted to the left side of the battery box. The stock air boxes have been removed for Uni foams and there's a nice little threaded receiver left to attach one of the TCI mounting ears to with a bolt and washer. Sidecovers fit as normal. 2K miles on so far, no prob.
Click to expand...
My whole subframe is different
 
30E9203D-E262-45C0-BEDE-B8361B988E7A.jpeg
Here’s the broken on ... half the board is gone . How it remained running I have no ideas .....
nj1639 said:
Alright D, if the bike got you home then the components are still working though the box is shot. I'll say that running a TCI its good to have a working spare.
If it's guaranteed to work with money back then go for it. Keep your busted one as a backup, you can swap the guts out if need be.......other opinions may vary.
Click to expand...
 
A stock wiring harness will only give you so much room to move the TCI connector about. Might look at mounting it under and to the seat, somewhere away from moving parts. Once bit, twice shy. We all do stupid stuff but hopefully get to live to laugh about it.

Yeah, don't know how it kept running being half there, though I'm no expert on what's in them and how they work.....Jim?
 
nj1639 said:
A stock wiring harness will only give you so much room to move the TCI connector about. Might look at mounting it under and to the seat, somewhere away from moving parts. Once bit, twice shy. We all do stupid stuff but hopefully get to live to laugh about it.

Yeah, don't know how it kept running being half there, though I'm no expert on what's in them and how they work.....Jim?
Click to expand...

nj1639 said:
A stock wiring harness will only give you so much room to move the TCI connector about. Might look at mounting it under and to the seat, somewhere away from moving parts. Once bit, twice shy. We all do stupid stuff but hopefully get to live to laugh about it.

Yeah, don't know how it kept running being half there, though I'm no expert on what's in them and how they work.....Jim?
Click to expand...
nj1639 said:
A stock wiring harness will only give you so much room to move the TCI connector about. Might look at mounting it under and to the seat, somewhere away from moving parts. Once bit, twice shy. We all do stupid stuff but hopefully get to live to laugh about it.

Yeah, don't know how it kept running being half there, though I'm no expert on what's in them and how they work.....Jim?
Click to expand...
nj1639 said:
A stock wiring harness will only give you so much room to move the TCI connector about. Might look at mounting it under and to the seat, somewhere away from moving parts. Once bit, twice shy. We all do stupid stuff but hopefully get to live to laugh about it.

Yeah, don't know how it kept running being half there, though I'm no expert on what's in them and how they work.....Jim?
Click to expand...
im not using the stock harness. I made up my own So I I’ll get it as far away from everything as I can
 
nj1639 said:
Yeah, don't know how it kept running being half there, though I'm no expert on what's in them and how they work.....Jim?
Click to expand...
I don't see how it was possible. Maybe it broke in half just as you shut it down? Dunno.... a real mystery.
Dxs, do you still have the other half of the board... the half with the ic chip on it? If so, I'd be interested in getting it from you.
 
Jim said:
I don't see how it was possible. Maybe it broke in half just as you shut it down? Dunno.... a real mystery.
Dxs, do you still have the other half of the board... the half with the ic chip on it? If so, I'd be interested in getting it from you.
Click to expand...
I literally rode it two more blocks after it broke. But once I shut it down that was it. It wouldn’t start back up. I have no idea where the other half is. It’s in the middle of the road some where
 
My 79 has the TCI but it was imported from Japan so at a guess one of the first models to have it. Still running it today. Also has the adjustable needle and noT between the BS34 carbies. Two 10mm banjos and 8mm hose.
 
Sorry dxs650. It’s just not possible for the ignition to work with half the TCI board missing. Is it possible that it was never hooked up in the first place? You must have another ignition system on the bike running it. The TCI module was probably left on the bike. I might be interested in the parts as well. Even broken the parts on it are more valuable than gold.
 
sleddog83 said:
Sorry dxs650. It’s just not possible for the ignition to work with half the TCI board missing...
Click to expand...

Sleddog83, it *is* a mystery.

However, his TCI is an earlier version, dissimilar to your later '83.
On your '83, the only thing that drives the trigger transistor (T4), which drives the power transistor, is the IC. Without the IC, it won't run.

A closeup of Dxs650's broken board.
80TCI-Dxs650.jpg


A closeup of the same region of Jaydela's '80 TCI.
80TCI-Jaydela02.jpg


Note the trigger transistor is T7, output dividers R44 and R45.
And, mystery diode D13 tied into that.

A pic of the topside of the '80 TCI.
80TCI-Xonix.jpg


It's a 2-sided PCB.
Unfortunately, I don't have a pic of the bottom side, so don't know who is driving T7.

Suspecting that T7 may have some driving circuitry remaining on the broken half...
 
Jim said:
I don't see how it was possible. Maybe it broke in half just as you shut it down? Dunno.... a real mystery.
Dxs, do you still have the other half of the board... the half with the ic chip on it? If so, I'd be interested in getting it from you.
Click to expand...
Jim
That looks like an early version, 12-01 board. I think the IC on those boards is easily replaceable with TI substitute. The problem is that the op-amp circuits on those boards appears to be “tuned” using paired parallel resistors. You would have to salvage the resistors and tantalum caps along with the IC. I think. This is just theory on my part. It would be nice to have both halves of the board and do a little forensic work on them.
As to the problem at hand, if the bike ran with half the board missing, then there is another ignition system hooked up and this module was not needed.
Dxs650, If you want to replace this module, any version will work. I am aware of three versions of the TCI igniter, the last one having seven wires coming out of it. It will also work, but will require swap out the connectors.
 
TwoManyXS1Bs said:
Sleddog83, it *is* a mystery.

However, his TCI is an earlier version, dissimilar to your later '83.
On your '83, the only thing that drives the trigger transistor (T4), which drives the power transistor, is the IC. Without the IC, it won't run.

A closeup of Dxs650's broken board.
View attachment 152559

A closeup of the same region of Jaydela's '80 TCI.
View attachment 152560

Note the trigger transistor is T7, output dividers R44 and R45.
And, mystery diode D13 tied into that.

A pic of the topside of the '80 TCI.
View attachment 152561

It's a 2-sided PCB.
Unfortunately, I don't have a pic of the bottom side, so don't know who is driving T7.

Suspecting that T7 may have some driving circuitry remaining on the broken half...
Click to expand...

I have been doing a bit of reverse engineering on these boards and have been working on a schematic. The half that he has left basically contains the circuitry that receives the pulses from the pickup coils and the circuitry that drives the coil. Everything in between is missing. It just won’t work! It would be like expecting your car to run without an engine. The IC on the 12-01 board is an easily replaceable quad op amp. The problem is knowing exactly which resistors to put in place. I think one or more of the op-amps are tuned with paired resistors to get a specific timed circuit, possibly and integrator circuit. I am currently working on a breadboard jig to simulate the pickup pulses so I can measure the timing “integrator” circuits with a scope.
 
I also noticed that the older TCI IC is a 14-pin dip, HA17902p, spec sheets available.
Your IC is a later 16-pin dip, (or 18-pin dip in a 20-pin package?) HA1825p, a secret.
 
Last edited:

Similar threads

E
Munit v02 CDI wiring
Replies
14
Views
951
jpdevol
jpdevol
Dxs650
Hugh hand built PMA relay confusion
2
Replies
20
Views
1K
Dxs650
Dxs650
Lowdown138
1980 wiring diagram. NO PMA
2
Replies
27
Views
2K
Lowdown138
Lowdown138
NerdyNerd
Wiring
Replies
2
Views
515
NerdyNerd
NerdyNerd
Crashedkiwi
The dark arts revisited (or how to correctly wire a regulator recitifier)
Replies
17
Views
1K
Crashedkiwi
Crashedkiwi
Back
Top