18" rear mag on '77-'78 KZ1000

I haven't gotten much info on the subject so I'll ask for info, or direction to any threads on it. What will it take to use an 18" rear mag off of a PoPo bike, or a GPz1100 on a standard '77- '80 KZ1000 or LTD? Thanks for any help.

Wow> Not much happening on this thread. I figured at least one comment saying, "I've never done this, but I want to know too." Haha

I think I've read a rear wheel from a 78 z1r but I'm not sure if you would have wo swap the rear brake too. Or pull the swinger and all from a police bike!

I have wheels from a 1983 GPZ1100

don

I'm pretty sure the rear mag off of a Z1-R will fit a KZ, but I don't have a rear mag off of a Z1-R to put on my KZ.:whistle:

Well now....I happen to have a set of wheels from a Popo bike that I would like to implant onto a 77 too. You have encouraged me to start digging into this.....I will have a look this weekend in my shop. What I do know is that the front forks are 1mm beefier and a bit wider that the stock 77s....the brake discs are definitely heavier than stock so I am expecting the back wheel will have similar issues/conditions. I will report my findings when I get some measurements

BlackZ1R wrote: I'm pretty sure the rear mag off of a Z1-R will fit a KZ, but I don't have a rear mag off of a Z1-R to put on my KZ.:whistle:

I have a 78 Z1R rim , not for sale, sorry, but I can take measurements.

No eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configuration

BlackZ1R wrote: I haven't gotten much info on the subject so I'll ask for info, or direction to any threads on it. What will it take to use an 18" rear mag off of a PoPo bike, or a GPz1100 on a standard '77- '80 KZ1000 or LTD? Thanks for any help.

Do you already have an 18" wheel you'd like to use? Or are you wondering what to search for?

I think if you had an 18" wheel from a 78-81 Police bike (or a Z1R or a Mk2) it should be pretty easy. The brakes are all the same 4 bolt pattern, and even though the LTD used a different rear caliper than the other KZ1000 bikes, it's likely you could swap parts and spacers around until it fit. It also looks like all of the KZ1000 cast wheels used the same sprocket carrier (pn 42008-040).

Note that the police 18" and the Z1R 18" rear are not the same part. The police bikes had a much thicker lip around the rim. The Z1R has a rounded lip at the outside edge of the wheel. The police wheel has a flat outside edge. Also from the parts diagrams it looks like the police wheel did not use bead locks. The Police rear wheel part number is 41073-1020, and it was used from 78 to 81. The 78/80 Z1R and 79/80 Mk2 all used the same rear wheel, pn 41073-1035.

Of course, it's probably just as hard to find a pre-1981 police wheel as a Mk2 or Z1R wheel.

You really want to know about the police bikes after 1981. Unfortunately, I'm not really helpful here. I know they used a different brake rotor mounting method, where the disk had no center hub. The rear caliper changed. The wheel got wider (pictures on ebay show 18 x 2.5", up from 2.15", and they are marked "tubeless"). It's likely that many dimensions changed at this point that it would be more work to fit one of these. Certainly still possible, but it may not be a direct swap.

I'm guessing here, but if you could find the entire assembly (wheel, swingarm, rotor, caliper, sprocket hub, etc) that would probably bolt onto the frame just fine.

Sorry you missed this one:

But there are these overpriced ones:

Thanks for the reply DOHC. Yes, I should have had my eyes opened up when that one was posted. Thanks for the insight.

No eBay APP ID and/or Cert ID defined in Kunena configurationHere is another one. Other than the black spray paint it looks decent.