z650 modern take USD forks/Monoshock

warren3200gt · #1 PostAuthor: **warren3200gt** » Mon Dec 14, 2015 10:05 am

I imported a KZ650 as a donor when I restored my UK B1 and ended up using very little of it. As a consequence I have a near complete bike to build a crazy project with. Currently working on the engine so have some time to source some modernish toys for it. Plan is to buy a shitter that has USD forks and monoshock so that I can nick the bits I need from it and out the rest as parts.
The swing arm is a period z900 dresda box section with additional bracing and monoshock mounts to be added.
Wheels are period 3 spoke CMA z900
The 650 frame is going to get chopped about A LOT (Trellis exo skeleton) so not too worried about hacking it to fit.
Question is does anyone know which shitter to buy so that there isn't to much engineering involved in utilising the existing 650 frame head stock and swing arm mounts.
I believe the head stock and swing are mounts are the same as a Z900

#2 PostAuthor: **Ginger Bear** » Mon Dec 14, 2015 10:57 am

If the swinger width is the same as Z900/1000 @ 235mm then Most Suzuki stuff will fit in there. GSXR600/750 SRAD, TL1000, Bandit & probably more recent Suzuki too. Kawasaki stuff ZX9R, ZX7R is too wide to fit without major work. Also check the forks for pitting from any 'shitter' that you might buy.

warren3200gt · #3 PostAuthor: **warren3200gt** » Mon Dec 14, 2015 11:28 am

Thanks, GB. I'm not to concerned about the swinger mounts as the DRESDA box I have fits. What I'm not sure about is the head stock. So I'm looking for a USD fork model where they will drop straight into the existing headstock if poss. Would also need to be Mono shock model so I can nick the shock, mounts and links etc. ZX6R? Zx7R?

#4 PostAuthor: **Ginger Bear** » Mon Dec 14, 2015 12:55 pm

Modern stems are normally thicker than a std Zed stem. You may be able to do some bearing swopping to achieve the desired end result. www.simplybearings.co.uk is a good place to start.

Failing that, chop the yokes from a Zed stem;

Turn down the leftovers of the yoke to the correct i.d. of your new yoke.

warren3200gt · #5 PostAuthor: **warren3200gt** » Mon Dec 14, 2015 3:37 pm

GB, is the stem just press fit into the bottom yolk on the more modern stuff? It would appear it was from your pic or did you have to drill it out? I always assumed they were at least keyed in some way.

#6 PostAuthor: **Ginger Bear** » Mon Dec 14, 2015 4:27 pm

Yoke was from a Hayabusa, it pushes from the top downwards, exiting the underside of the yoke. The original stem had a circlip on the bottom, preventing it being pulled upwards. You will notice my turned down stem has a small lip left on the bottom.

warren3200gt · #7 PostAuthor: **warren3200gt** » Mon Dec 14, 2015 4:34 pm

Found this which may help. Spose it depends on the stem length.
www.allballsracing.com/index.php/forkconversion

LeeJackson · #8 PostAuthor: **LeeJackson** » Mon Dec 14, 2015 5:22 pm

I built a 650 special many moons ago, I used FZR 400 front and back end, it was very easy, yokes were a straight fit with a swap in the head races (as per the all balls site mentioned) and the swingarm drops in with the exception of having to add twinshock mounts and I think a 6mm spacer either side.. I'll see if I can find some photos somewhere..

warren3200gt · #9 PostAuthor: **warren3200gt** » Mon Dec 14, 2015 6:18 pm

Hi Lee, didn't think any fzr's had usd forks though?

LeeJackson · #10 PostAuthor: **LeeJackson** » Mon Dec 14, 2015 7:59 pm

Warren, sorry I missed that detail

correct conventional forks

LeeJackson · #11 PostAuthor: **LeeJackson** » Mon Dec 14, 2015 8:08 pm

Found some photos here incase your interested..

http://www.turbomotorcycles.org/TMIOA/P ... ckson.html

This was it pretty much finished when I stuck the Turbo in it.. Still have it actually, stashed somewhere in Scotland to be revisited some day...

z650 modern take USD forks/Monoshock

z650 modern take USD forks/Monoshock

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