« previous next »
Pages: [1]   Go Down

Author Topic: K 75c Fork Springs  (Read 3476 times)

Offline ed3541

  • Motobrick Curious
  • Posts: 37
K 75c Fork Springs
« on: October 24, 2019, 10:18:36 AM »
Hi,
I have a 1995 K75c with squishy forks. A mechanic supposedly rebuilt my forks but the fluid leaked-out on to my brakes. I'm wondering if I can install fork springs in both tubes (like my old K75s). Does anybody know what parts I'm gonna need to put springs in both forks?
thanx,
Ed




Logged
  • Boca Raton, Florida
  • '92 K75s '95 K75 '85 FYK100

Offline Laitch

  • Faster than a speeding pullet
  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 10168
Re: K 75c Fork Springs
« Reply #1 on: October 24, 2019, 10:43:27 AM »
The K75C's last year of production was 1990. If yours is a 1995, it isn't a C-model.

A 1995 K75 should be equipped with a Showa fork unless the entire assembly had been swapped with an earlier model. The Showa tubes have external diameters of 41mm. The internal parts of both the left and right Showa tubes are identical. There already are springs in both tubes. First, determine the size of the tubes.

Your fork is squishy likely because there is little fluid in it. Did the fluid leak from the seals around the tube? Your mechanic might have used aftermarket seals. Original equipment seals are preferred.
Logged
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline ed3541

  • Motobrick Curious
  • Posts: 37
Re: K 75c Fork Springs
« Reply #2 on: October 24, 2019, 01:59:10 PM »
Thanx Laitch,

I'm gonna get some OEM seals.

Ed
Logged
  • Boca Raton, Florida
  • '92 K75s '95 K75 '85 FYK100

Offline Laitch

  • Faster than a speeding pullet
  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 10168
Re: K 75c Fork Springs
« Reply #3 on: October 24, 2019, 02:38:29 PM »
Take a close look at those tubes, ed. If they are pitted where they enter the lower tube, they are likely to make any seal leak.
Logged
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Martin

  • ^ Quintessential Motobricker
  • Posts: 4440
Re: K 75c Fork Springs
« Reply #4 on: October 24, 2019, 04:32:30 PM »
To extend the life of your seals pack heavy silicone grease between the seal and the dust cover. It stops road crud from getting to the seals and probably keeps them lubed and flexible. Change the grease occasionally more often in dusty conditions. I changed the seals on my brick when I first got it over 20+ years ago.
Regards Martin.
Logged
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline The Mighty Gryphon

  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 6650
Re: K 75c Fork Springs
« Reply #5 on: October 25, 2019, 07:06:58 PM »
Headlight isn't K75.  Probably isn't a K75S because those had 3 spoke wheels.  That would make it likely to be a chopped up RT. 

If I remember right, the RT had longer travel softer forks than the other models, and I think they used a couple more ounces of oil as well.  If they weren't filled properly, I could see them being pretty soft and squishy.  Brake dive on my K75RT can be pretty alarming at times even when filled with the correct amount of fluid.
Logged
  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Chaos

  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 3050
  • Mars needs women!
Re: K 75c Fork Springs
« Reply #6 on: October 25, 2019, 07:48:31 PM »
It's been cut up, missing rear cowl. Hard to say what it started out as.  Didn't RT's have the radiator hose outside the crankcase cover?  Or am I just getting senile?
Logged
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Past-my-Prime

  • ^ SuperNatural Motobricker
  • Posts: 501
  • All of us are better when we're loved.
Re: K 75c Fork Springs
« Reply #7 on: October 25, 2019, 08:22:56 PM »
Quote from: Chaos on October 25, 2019, 07:48:31 PM
It's been cut up, missing rear cowl. Hard to say what it started out as.  Didn't RT's have the radiator hose outside the crankcase cover?  Or am I just getting senile?

Mine's an RT and the radiator hose goes through the fairing, not through the crankcase cover.
Logged
  • North Shore of Lake Superior (in my garage)
  • BRICK: 1989 K75 RT - Rocinante; NON-BRICK: 2007 F650 GS Dakar - Betty Blue

Offline Martin

  • ^ Quintessential Motobricker
  • Posts: 4440
Re: K 75c Fork Springs
« Reply #8 on: October 25, 2019, 09:13:11 PM »
It's got 75s mirrors with the more streamlined back. And early 75s's did have the eight spoke wheels. What's on the compliance plate?
Regards Martin.
Logged
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline volador

  • ^ Quintessential Motobricker
  • Posts: 1165
  • NEEDS MORE CHROME
Re: K 75c Fork Springs
« Reply #9 on: October 25, 2019, 10:51:00 PM »
Logged
  • NYC NY
  • 1991 K100RS 1993 K75S ABS
5 BOROUGHS SISYPHEAN SOCIETY  MAINTAINING THE OBSESSION

Offline volador

  • ^ Quintessential Motobricker
  • Posts: 1165
  • NEEDS MORE CHROME
Re: K 75c Fork Springs
« Reply #10 on: October 26, 2019, 10:26:08 AM »





Logged
  • NYC NY
  • 1991 K100RS 1993 K75S ABS
5 BOROUGHS SISYPHEAN SOCIETY  MAINTAINING THE OBSESSION

Offline Laitch

  • Faster than a speeding pullet
  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 10168
Re: K 75c Fork Springs
« Reply #11 on: October 26, 2019, 10:48:08 AM »
Quote from: volador on October 25, 2019, 10:51:00 PM
'95 may or may not have 50A alternator
A 1995 original K75 will have the 50A alternator but like any used moto. parts might have been swapped along the line. ed needs to run the last seven digits of both his motos' VINs through the realoem VIN checker to determine what the motos might have been originally.
Logged
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline ed3541

  • Motobrick Curious
  • Posts: 37
Re: K 75c Fork Springs
« Reply #12 on: October 26, 2019, 01:08:28 PM »
Quote from: Laitch on October 26, 2019, 10:48:08 AM
A 1995 original K75 will have the 50A alternator but like any used moto. parts might have been swapped along the line. ed needs to run the last seven digits of both his motos' VINs through the realoem VIN checker to determine what the motos might have been originally.

Yes I did the Vin# search and determined that it is a K75 not a K75c
thanx,
Ed
Logged
  • Boca Raton, Florida
  • '92 K75s '95 K75 '85 FYK100
Pages: [1]   Go Up
« previous next »
Tags: k75 fork springs