zrx to kz 1000 front end converison

i done a zrx to kz front end conversion,




thought i would share some pics of how the gauge mounts turned out.
the zrx had an ignition loop and gauge mounts that had to be machined away first to slick up the upper triple.




i didn't get pics of the operation but it was pretty straight forward port-a-band and mill work :lol: .
here is a shot of a factory kz gauge mounting layout.


i machined up some weldment fittings (from a steering stem out of a zx636 ) to match the internal hourglass shape of the factory mounts.


i found my data points and machined a couple notches in the upper triple to locate the fittings for welding.




and it was so stinkin (99 with a 110 heat index) hot i forgot to get any pictures of my gorilla aluminum welding before i machined it all off :sick: .
i milled the welds off the top, then used my head porting tools to do the fillets down the sides of the weldments.
then cleaned it up with a flapper wheel and the belt sander.



thanks for lookin,

leon

Always a pleasure to read your project posts
Dave

AWESOME

Nicely done.
How is the speedo connection to the front wheel going to go?

thanks for the kind words guys.

texaskz,
that would be a good question for the guy who is building the bike. :whistle:
i'm just the fabricator :evil:
being as the zrx drives off the front wheel like a kz i'm going out on a limb and saying motion pro can prolly make a cable to work.


leon

nice work as always Leon

I may be going a bit off topic here...
Unless he is planning to use an electric speedo from an LTD, I can see how that could work. Do you know if the ZRX uses the same reduction ratio as the KZ ?

531blackbanshee wrote: thanks for the kind words guys.

texaskz,
that would be a good question for the guy who is building the bike. :whistle:
i'm just the fabricator :evil:
being as the zrx drives off the front wheel like a kz i'm going out on a limb and saying motion pro can prolly make a cable to work.

leon

TexasKZ wrote: I may be going a bit off topic here...
Unless he is planning to use an electric speedo from an LTD, I can see how that could work. Do you know if the ZRX uses the same reduction ratio as the KZ ?

531blackbanshee wrote: thanks for the kind words guys.

texaskz,
that would be a good question for the guy who is building the bike. :whistle:
i'm just the fabricator :evil:
being as the zrx drives off the front wheel like a kz i'm going out on a limb and saying motion pro can prolly make a cable to work.

leon

I have read somewhere defore that the reduction ratios for most (keyword most) Japanese bikes are the same. The topic was brought up by me when someone was wanting to use a small simplified speedo on a KZ650. I believe it was one of the local FB forums I belong to.

The reduction ratio is the same if the wheels are the same size but since the zrx runs a 17" wheel it is going to be different. There is a Japanese company (name is escaping me right now) that makes OEM looking speedos for 18" and 17" wheels out there though.

It works. The way they do it is the speedo heads take a certain input speed (2440 Rotations Per Mile) IIRC. This is based off the designed overall wheel diameter. So as long as you use the stock front wheel, with the stock speedo drive, you should be good to go. Get Motion Pro to make you a cable in case of differences and you are there.

Very nice setup as always Leon. I ended up making those rubber isolated brackets that used the handle bar bolts that flushed the gauge cluster with the top triple. This looks stock though.

Cory

Seems like Martin posted about this recently and mentioned that some speedometers even have the ratio stamped on them somewhere.
I wonder if riding helps memory, too?