84 GPZ Mono/KZ 1000 Hack job in Progress

I am going to attempt to put an 84 GPZ 750 shock and swinger on a KZ frame. I know it is not the best all out performance swap. I just want the looks of a monoed KZ . Only corners in ND are intersections anyhow.
The good.
* Donor is a tad narrower in front
* pivot bolts are same diameter
* rear width is real close
What I need to figure out
* The axle shaft is 19.95 mm diameter on the KZ--16.95 on the GPZ What are my options here? Sleeve the smaller shaft or have the eccentrics bored for the KZ axle?
* How does one go about setting up ride height? Would I be safe in placing the top of the shock the same distance from the swingarm shaft centerline as the donor bike?

Thanks for any and all help/advice. This is a bit above my pay grade but I think I can do it Hopefully not another hack job
Wayne

Figure out the amount of travel in the gpz suspension and make sure to allow for it when you tack the parts on to your frame,yes you definitely want to tack weld everything on first then stand back and check things from different angles .
As far as the axle goes you might be able to just do a bearing swap to adapt the gpz axle to your wheel

everything should be close if I were doing it just change bearing in wheel if axle is different
Should have axle for the eccentrics swinger


should have plenty to measure from the with correct placement of brackets

I adjusted my ride heght with the jack and a tape measure compare the pieces you have measure there reletive distance from the mono frame vs the stck frame

ramtough_63 wrote: everything should be close if I were doing it just change bearing in wheel if axle is different
Should have axle for the eccentrics swinger


should have plenty to measure from the with correct placement of brackets

I adjusted my ride heght with the jack and a tape measure compare the pieces you have measure there reletive distance from the mono frame vs the stck frame

Having the whole back half of the frame is a big help for me. It is alot easier to get my mind arounf it and visualize it. Thanks Ram.
Wayne

I got a heads up from a member (Thanks Bozo) that the pivot bolts ARE different. I thought they were the same because the threads are the same size on both. Sure enough the GPZ is 17mm verses the 16mm of the KZ.
So what can I do?

Bore the frame to 17?
or
Bozo used a sleeve out of a 550 GPZ. Not sure which year yet. Ron Ayers does not have a fiche for the older GPZ's so I need to look around a bit.

Any thoughts? Thanks

On my 83 GPz750 arm I drilled the frame to fit the GPz bolt
and trimmed about 1/16" off both sleaves.
As for the rear axle there is not a bearing that fits the KZ1000
hub and the GPZ axle.
I had some sleaves made to press on the GPz bearings to fit the hub.
Added two flat washers to the spacers on each side and it bolted up.

Yahoo, someone else who has done it! Did you use a 17mm ream or a drill bit? I had thought about boring the eccentrics to fit the KZ axle but am concerned about the amount of material that would be left. Thanks for the input and Merry Christmas.
Wayne

Done it three times. First time we used a 17mm drill bit on the frame and GPz750 rear wheel. Second time 84-86 GPz900 spacers and GPz750 pivot bolt with holes in the adjusters enlarged to 20mm. Third time was 84-86 GPz900 spacers with 2000 GSX750 rear wheel (17mm axle). All three times we converted the swing arms to dual shock.

I had thought of going with the GPZ wheel. Was that pretty straight forward? Not sure how I would like it with the stock front mag. Might be okay if painted to match.

I don't remember the KZ axle size but you bored the adjusters? That is what I would really like to do if it leaves enough meat.

Appreciate the input, Merry Christmas
Wayne

I used a 5/8" drill bit and the bolt fits the
frame perfect.
I looked at drilling the eccentrics but one is a
press fit to the axle and if their not drilled dead
on the axle ain't gonna go back in.

Hi, KZ, As I have stated to you the main pivot bolt is different (16mm for KZ vs 17mm for GPZ) but if you can find a sleeve that has the same internal 16mm dia and external 20mm (I think) from other motorbikes you don't have a problem, at the end I used the GPZ550 monoshock sleeves (2 off) with a spacer in the middle There are lots of sleeves listed that will fit (I couldn't buy a new sleeve anywhere).

Measure the internal distance where the frame pivot goes and make the spacers fit (the right hand side that goes on the roller bearing was 11mm.

As for the frame clearance, check my pictures. I sculptured the swingarm to clear the brake bracket. If you have a different setup you are blessed.

As for the rear axle, I used the GPZ rear wheel/ brake with gearing to suit using a 530 chain again that took a while to get right because before I put the swingarm on I measured the sprocket distance from the centre of engine (you can also use the old wheel setup to do this but not as accurate). I idea was to make sure the sprocket distance from centre is the same on the rear wheel (I had to machine the sprocket hub) or space the engine sprocket out which might be easier. You can see on my setup the chain is nearly rubbing on the wheel hub (I did have to file (yes it was a rough way of doing it) around to clear (I used a hyabusa chain with wide links).

The biggest problem (apart from others) was getting the rear wheel spaced correctly to sit centre as the swingarm might not be perfectly central on the pivot.

Why did I do this, I couldn't wait any longer for the JMC swingarm I never got.












Good luck, I'll help as much as I can

Heres my chain side I run the KZ650 530 chain
and sprocket set up.