Author Topic: 1992 K75 driveshaft and final drive, fits K100 (higher revs)—DOA/NLA (Read 5694 times)

mibh · « **on:** August 17, 2019, 01:30:36 AM »

i did not know how to include pictures before, so the first edition of this topic was (appropriately!) blocked by the moderator. my apologies to all.

i stripped the splines out of my 1985 K100RS driveshaft a few weeks ago, and pulled the driveshaft and final drive off a 1992 K75 hangar queen to get myself back on the road. afterward i replaced the driveshaft and went back to the K100RS final drive, because the K75 final drive ratio was a bit too low -- my RPM's were about 10% higher at highway speed. this meant great low-end torque but more engine noise on straight roads. if not for all the straight roads in between the twisties, i'd've kept this K75 drive. however, i want the K100RS to remain stock.

note that the final drive and driveshaft are a matched set; the number of splines on the interface is different for the K75 vs. K100RS vs. K100LT. i'm selling a matched known-good final drive and driveshaft from a 1992 K75, which i just road-tested to las vegas and back in my K100RS.

$250 + shipping. i'll make a note here if it's sold.

Laitch · « **Reply #1 on:** August 17, 2019, 05:17:50 AM »

What is the gear ratio of that drive? You'll find it stamped into a flat spot on the rear of the drive housing.

mibh · « **Reply #2 on:** August 17, 2019, 10:52:16 PM »

your guess is as good as mine, from what's stamped (see picture). but it's 3.2:1 or so, which sounds like 32/10, which was factory for this year.

volador · « **Reply #3 on:** August 18, 2019, 01:51:12 AM »

Rotate FD 90° clockwise from picture
Gear Ratio is stamped on flat top, closest to the swingarm mating surface

Laitch · « **Reply #4 on:** August 18, 2019, 02:49:05 PM »

Here's the stamp location on my moto's rear drive, as correctly indicated by volador.

mibh · « **Reply #5 on:** August 18, 2019, 03:25:36 PM »

thanks, it was hiding under some road grime. it's 32/10 as measured and as was factory spec for the bike it came from.

Laitch · « **Reply #6 on:** August 18, 2019, 03:38:46 PM »

So much swapping goes on among these motos, it's good to have verification whenever possible in reference to parts.

Feo · « **Reply #7 on:** August 19, 2019, 07:02:37 PM »

Sent you a PM about shipping.

mibh · « **Reply #8 on:** August 22, 2019, 01:36:24 PM »

was sold, 2019-08-21.

johnny · « **Reply #9 on:** August 22, 2019, 03:45:22 PM »

greetings...

how much and to who who who...

j o

mibh · « **Reply #10 on:** August 22, 2019, 04:09:42 PM »

Quote from: johnny on August 22, 2019, 03:45:22 PM

greetings...

how much and to who who who...

j o

the final sale was reported one reply above yours.

the asking price was reported in the base note.

johnny · « **Reply #11 on:** August 22, 2019, 04:58:56 PM »

greetings...

so it was $250 + shipping and was sold to feo... is that right...

j o

Feo · « **Reply #12 on:** August 22, 2019, 05:07:09 PM »

Yep, I need to give a 32/10 a try on the sidecar rig. Might make 3rd and 4th more flexible.

Wasn't planning on much over 70 mph anyway.

Past-my-Prime · « **Reply #13 on:** October 17, 2019, 11:04:57 PM »

Glad to see that these come up occasionally; sorry I missed this one.

mibh · « **Reply #14 on:** October 20, 2019, 08:51:07 PM »

to finish the story, you missed nothing. i packed it badly and the driveshaft was lost in transit. the buyer rejected the diff itself due to bearing noise. i refunded his costs and asked him to dispose of it locally.

Ray Charles · « **Reply #15 on:** October 24, 2019, 08:43:00 AM »

Quote from: Past-my-Prime on October 17, 2019, 11:04:57 PM

Glad to see that these come up occasionally; sorry I missed this one.

You might be past your prime but you'll never be this young again. Keep ridin' and keepin' your inner kid alive. :-) Ray

Past-my-Prime · « **Reply #16 on:** October 26, 2019, 10:10:35 AM »

Quote from: Ray Charles on October 24, 2019, 08:43:00 AM

You might be past your prime but you'll never be this young again. Keep ridin' and keepin' your inner kid alive. :-) Ray

LOL I'd be riding today if I had a new driveshaft and pinion gear (or complete FD).

Northern Pike · « **Reply #17 on:** January 11, 2020, 09:50:36 AM »

Hey Past-my-Prime,

You and me both. I'm practically a neighbour of yours, here in southern Ontario, with the same problem.

Past-my-Prime · « **Reply #18 on:** January 11, 2020, 10:02:06 AM »

Quote from: Northern Pike on January 11, 2020, 09:50:36 AM

Hey Past-my-Prime,

You and me both. I'm practically a neighbour of yours, here in southern Ontario, with the same problem.

Well I have a line on a replacement ds/fd. And a second possibility has come up. If that pans out, I'll let you know!!

Right now what I'd like is a warm place to work on my bike. And a lift. And some more mechanical skills. And a few more tools.

Meanwhile it's -20 outside and we have deep snow so I'm going somewhere warm for a few weeks.

Northern Pike · « **Reply #19 on:** January 13, 2020, 09:25:40 PM »

Thanks!

Good idea. Have a nice trip! I'll be here trying to stay warm.

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Author Topic: 1992 K75 driveshaft and final drive, fits K100 (higher revs)—DOA/NLA (Read 5694 times)