Weird Tach Behaviour

[moto_dan]

JD,

The tacho with the replaced capacitors still works like a dream!!!

Have drove 1500 km now.

Sounds good. Now I'll reread your instructions and possibly be able to repair mine on my '83 GS750.

[Anonymous]

OK one more time please?!?

Hello I have read the post and am happy that someone figured it out because I have the same problem on my '83 GS750ES. now the only problem is things got wired and changed so many times that I'm confused as to what goes where. The way I understand it is that I should use a 3.3uF/50V and a 4.7uF/50V capacitor? I haven't much experience with any of this so is it easy enough to do alone or should I get help or have someone do it for me? Also may I suggest someone write up a good set of instructions and have them permanently posted on the site in the Garage or some other sections, I'm sure there are lots of us with this problem.
Cheers,
Shaun

[kz]

This is valid for a GSX 1100 EF, 1984 and GS 1150 ES, 1984 with electronic tacho, I don't have any knowledge of other models with electronic tacho.

I put a lot of effort in this matter, unfortnally I at first got a wrong spare capacitor, due to both me and the sales guy at Elfa where reading the wrong numbers on one of the mounted capacitor.

Here are the correct figures, for the capacitor I changed on the tacho board and got my tacho working:

1 off Electrolytic Capacitor 4.7 uF, 25V, Elfa stock-number 67-013-46
1 off Electrolytic Capacitor 33 uF, 25V, Elfa stock-number 67-003-63

The max. Voltage of one of the Elfa Capacitor is 50V, higher max. Voltage doesn?t matter; the only problem is that the capacitor is a little bit bigger and a little more expensive (like 2 cents more or something, but in production this costs really matters).

You can use the Elfa numbers to get the correct values (in PDF-format) and then buy the capacitors at your local electronic dealer (or order them on-line at Elfa).

Visit www.elfa.se/en and click the ?Datasheets? button at the left of the page, then you enter the Elfa stock-number and you find a specification of the capacitors.

I have a scanned picture of my tacho board on my homepage where you can compare if your board looks the same as mine. www.karl.zellner.com

If you have normal mechanical and soldering skills this is not a problem to do yourself.

[Anonymous]

Karl:

Let me be the first to propose you for the GSResources "HERO OF ELECTRONICS" award. You have shown doggedness, thoroughness and diligence beyond the call of duty.

This pesky electronic tach problem has bothered people for years, without solution. I had resorted to using red pinstripe on the face of my speedometer to indicate red line in each of the first 4 gears.....I had even almost turned into Basil Fawlty (of Fawlty Towers) in the temptation to beat my recalcitrant vehicle with a tree branch. It may take a few weeks or months before I attempt the repair but at least I now know it is possible.

Heartfelt thanks and congratulations to you (in Swedish).

Simon Waters (83 GS750ES)

[kz]

Thank you Simon, the award really warmed, after the discussion on the forum I just couldn?t give up even if it looked very dark for a day or two.

As it looks, this is a common problem, so I will put in a summary of my conclusions in the tips and tricks area.

I'm also very interested to here if anybody else succeeds to solve the bouncing tach problem in the same way I did.

Maybe I should have a working tach as avatar after all??.

[Anonymous]

Hi guys sorry for my delay, I just installed the new capacitors today, and fantastic it revs past 4000 RPM now. The needle is a bit fluffy with its response but I think thats due to the deteriorating wires and connections throughout the bike. Otherwise its great!. Karl you have been extremely helpful on this unusual problem, thanks for your help

[Anonymous]

GS750ED electronic Tachometer

I read the post on the Tachometer problem. I can't get my Tach to work. I disassembeled the cluster. According to the wire diagram, the wires going to my tach should be B/W, O, and B/Y. On my Tach the actual colors are Brown, Orange and White. Does anyone know how I cross these? The previous owner hacked the wires. It appears that the wires on my harness are like the colors of the wiring diagram. Also is there a way to test the circuit board using just an Ohm meter alone? Which wire is considered the ground and which would come from the ignitor? HELP?

[kz]

Re: GS750ED electronic Tachometer

This old thread going alive again.....

I read the post on the Tachometer problem. I can't get my Tach to work.

Is it stone dead or does it bounce?

I disassembeled the cluster. According to the wire diagram, the wires going to my tach should be B/W, O, and B/Y. On my Tach the actual colors are Brown, Orange and White. Does anyone know how I cross these? The previous owner hacked the wires. It appears that the wires on my harness are like the colors of the wiring diagram.

If I remember correct, on the GS 1150, + and - is labeled in white very small on backside of the tacho board, maybe that can help you.

Also is there a way to test the circuit board using just an Ohm meter alone?

I'm afraid not, if you wan't to check the function of the board.

[Anonymous]

The Tach doesnt move at all, I question if it was hooked up correctly at all. There is some discoloration on a few parts and some sort of corrsion on the board. I am wondering if the previous owner hooked it up incorrectly (not knowing where to connect the brown and white wires) and burned something up. Is there a way to test this or do I need to look for a new board?

[Tv]

I'm glad this thread is alive again! I posted this Q the other day. When the bike is running the tacho will sit at about 2000 revs. When I ride the bike it will slowly move up to 4000 or maybe 5000 then slowly back to 2000 no matter how much I rev it. It's not erratic and the needle does not bounce around.
I've tried replacing the capacitors as suggested in the Tips and TRicks post but nothing changed (except now the Oil Temp guage no working either - don't know what I did there)

ronev, I'll go over and check my tacho (bike is at another place), which is in bits at the moment and I'll get back to you with some wiring details. I'm keen to get mine fixed.

REgards
Tv

[Tv]

ronev
my tach out wires are orange,white and brown. They connect orange to orange, white to white and brown to black/yellow
hope this helps
Tv

[kz]

ronev, I'm afraid I don't have a wiring diagram for the 750, and can't help you with info how to hook the tach up.

Tv, do you also have a 750 or do you have an 1150?

Could any of you post a picture of the 750 or 1100 -83 board, as I can see from the replys here since 2002, the capacitor fix has only worked on 1150 and not on 750 and 1100.

Could be interessting to figure out what the difference is between the boards (if any).

The best way to test the tacho is, in my opinion with a signal generator.

[Tv]

My bike is a GSX1100ES Australian delivery. I'm not sure what the difference between my bike and all the others but there are not too many like mine around. There is a pic in the gallery in the 1983 section labelled Tony V.

I'll post a pic of the board ASAP.

REgards
Tv

[Tv]

See if this works

[Tv]

I got the pic facility to work. Is this the same board?