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Replace final drive for touring?

  • Thread starter Thread starter stupiferodious
  • Start date Start date
S

stupiferodious

Guest
Got a 1980 GS850G resurrection project pretty much done. Love riding the bike except for the gearing. 4000 RPM at 50 MPH does not lend itself to relaxed touring. Would replacing the final drive unit with a GS1000 or GS1100 unit bring down the revs?
 
Something not right - I'm closer to 60 at 4000. I think I remember reading something like 41xx revs at 60mph for most of the 850s.
 
Isn't there a thread here (or perhaps a document on BassCliff's website) that gives all the ratios available to the shaft drives?
Myself, I just go up one tooth on the countershaft and I am done. ;);)
 
Brendan W said:
Something not right - I'm closer to 60 at 4000. I think I remember reading something like 41xx revs at 60mph for most of the 850s.
Click to expand...
His tach appears to be incorrect when compared to mine as well.
 
Last edited:
is there any identifying marks on a GK final drive?
i have what i think is a GK final drive for over 20 years.
i only parted out one shaft drive and it was a GK.
memory foggy~~~~
 
Should be doing about 56 mph (accordingn to GPS) at 4000 RPM.

Have seen that consistency with five different 850s, both G and GL models, and various years.

If your speedo is reading fast and you have the stock 90/90-19 tire on the front, you will be able to slow it down by installing a 100/90-19 tire.

Don't worry about the revs for touring use, the bike thrives on them.

My wife shot this over my shoulder ...
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IMG_4308_zpsfd1d26c4.jpg


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While chasing this motley crew:
IMG_4275_zps864039ce.jpg


.
 
blowerbike said:
is there any identifying marks on a GK final drive?
i have what i think is a GK final drive for over 20 years.
i only parted out one shaft drive and it was a GK.
memory foggy~~~~
Click to expand...


All 1983+ 1100G bikes had the taller rear end ratio, not just the GK.

You can check the ratio by manually turning the input flange while watching the output.

No marks on the exterior as far as I've seen.
 
Eric wanted me to post this for him, His GS1000G with a 2.66: 1 final drive ratio.
 
THE GS 1000 secondary gear set WILL NOT fit the 850. I believe the GS1000/1100 are interchangeable not 100 % sure
 
He's probably figuring it with a 17 in rear wheel as all the bikes that came with the 2.91 had 16" wheels
 
hjfisk said:
He's probably figuring it with a 17 in rear wheel as all the bikes that came with the 2.91 had 16" wheels
Click to expand...
Using a different size tire does not change the final drive ratio.

Personally, I will just consider the source. :-\\\

.
 
Lynn, can you tell me why they won't interchange? Is the output shaft spline of the 1000/1100's transmission a different size than the '850 or ?
 
Steve said:
Using a different size tire does not change the final drive ratio.

Personally, I will just consider the source. :-\\\

.
Click to expand...

First off I didn't see Steve mention any tire size when he posted about "Goldie" Erics G. His bike does have a 2.66:1 final drive. I can attest to that, since I have the same item to do the conversion on SuzyII, my 1000G. I plan on doing it when she becomes a 1100G.:cool:

Sorry, but I'm sworn to secrecy and until I get the go head from Eric, you'll have to figure it out yourself.:p
 
The tease is right up Eric's alley. "I know the answer but I'm not telling you"...blah blah blah. What ever. Even in death (so to speak) Eric is annoying.:hand:
 
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