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1Back to top Go down   K75 yokes on K100 8v Empty K75 yokes on K100 8v on Sun Jun 30, 2019 12:46 pm

Snod Blatter

Snod Blatter
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Hi all,

I have fitted some Showa forks to my '89 K100RS and did eventually get the yokes to clamp the new, slightly smaller diameter forks but I don't really trust it as I had to tighten the bolts about 4 times before the forks stopped slipping upwards. I also have a notch in the steering head bearings so I figure why not replace the yokes with proper Showa ones at the same time? Problem is, some research has reminded me about my handlebars being rubber mounted and the 75s had that Fluidbloc thinger so maybe it's not that straightforward.. So, question time!

1) Can I fit K75 top and bottom yokes? Am I missing something obvious that would be a blocker? Will my button pad thing still fit?

2) Can I fit just a K75 lower yoke? If the bottom was clamping properly at least then I'd feel much happier, given the size of the bolts in the top yoke it's very secondary anyway. Are the threads the same on the stems? Are the stems even the same length??

3) How buzzy are the bars if solidly mounted on a 100? I do actually hate the queasy feeling of the rubber mounted bars but I'd also hate constant vibration white finger..

Sorry if all this has been covered time and again but a google search didn't bring up any help..


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

2Back to top Go down   K75 yokes on K100 8v Empty Re: K75 yokes on K100 8v on Sun Jun 30, 2019 5:08 pm

nino

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Hello, I dont know about difference in diameter of tubes but I mounted upper triple clamp from K 75 to K 100 early type without any problems. It happened two years ago I am shure that I got much better, firmer steering. Never go back to rubber mounts again. If the engine was properly tuned no noticeable vibes or buzzing. Full reccomendations.

    

3Back to top Go down   K75 yokes on K100 8v Empty Re: K75 yokes on K100 8v on Sun Jun 30, 2019 5:14 pm

Snod Blatter

Snod Blatter
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Excellent, thank you nino. My motor is a bit buzzy (increasingly so..) but I do have the kit to balance the throttle bodies so it shouldn't be impossible to fix.

So, top yokes appear to be interchangeable. But are the bottom yokes and their stems interchangeable?


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

4Back to top Go down   K75 yokes on K100 8v Empty Re: K75 yokes on K100 8v on Sun Jun 30, 2019 5:18 pm

nino

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I really dont know. K 75 has steering damper?!

    

5Back to top Go down   K75 yokes on K100 8v Empty Re: K75 yokes on K100 8v on Sun Jun 30, 2019 8:03 pm

MartinW

MartinW
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You don't have to fit the damper which is called a Fluid Block. It is basically a tube with a waffle pattern molded into it, into which heavy silicone grease is spread. The fluid block resides between the upper and lower steering head bearings. Even some k75 owners are now omitting the damper as it is no longer available new. Link https://www.youtube.com/watch?v=e9EU0OQoMDo
Regards Martin.


__________________________________________________
K75s Hybrid
    

6Back to top Go down   K75 yokes on K100 8v Empty Re: K75 yokes on K100 8v on Sun Jun 30, 2019 9:56 pm

duck

duck
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I have K1100 forks and trees on my K75 Frankenbrick.  The steering stem has a smaller diameter so the Fluidbloc damper serves no purpose.  The only difference I noticed is that the steering is a tad wobbly at very low speeds - like when creeping forward behind a line of cars at a stop sign.  When I switched that bike from bias ply to radial tires that mostly went away and I now only notice it if I'm really paying attention to the steering.

You can stiffen up the rubber mounts on K100 fork trees by adding some washers as described at this link:
http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/demushk100bars/demushk100bars.htm


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

7Back to top Go down   K75 yokes on K100 8v Empty Re: K75 yokes on K100 8v on Mon Jul 01, 2019 4:45 am

Arlina

Arlina
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There are 3 different diameters for the forks.
The 75 yokes will fit without a problem, but youre gonna miss the rubber mounting for the steer.
Your conversion, the only benefit is the forkbridge.


__________________________________________________
K75 yokes on K100 8v Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde
    

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