GS Brainwave Tech's! Can you answer this question??

[feelergaugephil]

Instrument clock change over.....
I own a GS1000G (81) and on the speedo is 85mph, I just aquired a 140mph speedo.
Everything seem to fit and bolt up fairly easy (it's from a 79 GS750)
My problem is:- on my speedo (on the rear side on the inside) there is a slot that looks like a long (width) bulb of some sort which pushes in (like the instrument bulbs) I looked in the manual and all it says is that part is a "distance sensor"
On the newly aquired 140 speedo there is no slot for this distance sensor!
What is it? and can I use this clock without attaching this sensor part?
Thanks guys. Phil.

[gtsg01]

The sensor is used to make your self cancelling turn signals cancel. You will have to remember to manually cancel the signal.

[focus frenzy]

first ride the bike and see if the speedo is going to read correctly.
when I did what you are doing the donor speedo from a 79 750 didn't read right.
if it reads right, you can take the two speedos and measure the location of the opening and using a dremmel cut a matching hole in the 79 speedometer and install the sensor in it and your self cancel turn signals will work as designed.
that item is a magnetic reed switch, inside the glass tube is a very tiny metal contact, as the magnet in the speedometer spins and it makes the reed contact move back and forth making contact with a fixed contact in the end of the tube.
this gives the turn signal controller a reference signal so it knows how far you have traveled.

[feelergaugephil]

Speedo

Well thank you for your prompt return e-mail. I had no idea what that part was/is, it makes sense now.
Will have to wait a few weeks though to try it out as it's too cold to paint the bike.
But as soon as I try it I will post reply. Thanks again.

[Hoomgar]

You may need to use the hub for the 750 that the speedo came from. (or like bike)
It is possible it will have a differant gear ratio than the one on your bike
and if so it will read wrong for sure. It will also mater if your front wheel
is a differant size than that of the 750.

[feelergaugephil]

speedo

My front tire size 350-19, what is the 750????

[mcycle-nut]

Re: speedo

My front tire size 350-19, what is the 750????

The same. The speedo should work. I put one from a '?? 850 on my '78 750 and it works just fine. As I recall, I think I put a piece of tape over the hole in the side of the speedo that had to do the self-cancelling crap.

One difference though. One clock says "Suzuki" on the bottom, and the other one has the Suzuki "S." I was devasted.

[feelergaugephil]

speedo

Thanks for all the tips, as soon as it's all ready I will get one of my co-workers to radar me at 30-40-50-and so on to see if it's all accurate as I don't need a speeding ticket!