My 1974 z1-900 Conversion.

Almost done powder coated frame, (2000 zx7 wheels,forks,tripple tree's,clip-on's,brakes that are not on yet.) 2004 zx6rr swing arm,rear brake not on yet, mono-shock that was fabed into the frame.) home made brake pedal for a side winder pipe.

WTF, that's my bike... hahahahaha! :laugh:

Question, what are you doing with the Sprockets?

I have been having a hell of a time obtaining a 18 tooth 530 pitch sprocket with an 1/2" offset from Kosman.
I've queried others as well where I'll most likely go back to the 630 pitch and via JT Sprockets using a 1980/82 KZ750 E1/E3 JTR501 rear 630 sprocket for they have the same bolt pattern.

Old Man Rock

Very nice job. I love the orange color.keep up the pics.

For that reason is why I'm staying with the 630 style chain,sprocket with only a 5/8" offset through shnitz raceing.

Did you have any chain clearance issues with the frame in using the 5/8" offset?

I'm using a ZX6 rear end and in reviewing others postings they had clearance issues...

Did you have to mill down your rear hub?
If so, dimension please...

OMR

Yes i have some clearance issues very small, trying to work those bugs out, when I rode it last it rubbed alittle just thought that was the best it could be any help there would be great. thanks

"me clearance issues"... was afraid of that.

Just use the search function for 5/8" clearance issues and it will bring up all sorts of topics on the subject.
Basically, what I have reviewed by others they had to do the following depending on the swing arm installed.

1) Heat up and clamp bend it in or cut a section out of the frame where the chain was rubbing and re-support.
2) Mill down the rear hub for clearance of the tire.
3) Use a smaller width tire in combination with the milling of the hub.
4) All or combinations of the above mentioned items.

For me, I think I'm going this route since I'm having such a hell of a time getting a 530 18 tooth 1/2" offset for my KZ900.

americanclassix.com/streetfighter_conversions.html offers swing-arms capable of 190mm tire. They also offer a 13.5mm (slightly over 1/2" but under 9/16") 630 offset counter sprocket to be used with these arms. In measuring the old KZ900 to the ZX-6 rim center to inside sprocket and in using their offset I come up with ~ 1/6" difference.

Basically giving Kosman another week but since they haven't even replied to my e-mails (received a 15 tooth , tested and sent back) I'll most probably stick with the above and get on with it.

Old Man Rock

BTW... your bike looks awesome, love the colors...hahahahaha
In reviewing your images makes me kick myself in the ass for not going powder coat for your just look wicked...

Oh and on your brake lines... I just orederd mine from JPCycles.com, black chrome! YEAH BABY...

www.jpcycles.com/productgroup.aspx?GID=A...ore=Sportbike&page=1


OMR

I am using a 5/8" offset 630 setup. I had to heat the inside of the frame rail with a torch and then squeeze it with a c clamp. This flattened the inside only. don’t forget too do this for the bottom of the chain as well as the top, and go a little higher than u think u need too. as the chain stretches or u add weight the chain will go further. i also ground off the inside of the foot peg mounts. Now the chain hits the bottom of my aluminum motor mount on occasion. I am going to have a rub plate made for that so the mount doesn’t get warn anymore.
if u can make a 3/8" off set work u wont have frame issues.

I beleave a friend might have a 1/2" , 3/8" (630) off set sprocket to borrow to test fit if he does I will post my findings by the way I'm useing a 190 rear tire on a 6" wide wheel and it is staying so the only option for me is the sprocket or changeing to a 530 will see.

190 . I like it! I have a 5.5" / 170 . with my combo (zrx12 rear end)I had too mill the hub down to center the rim.this brought the tire closer to the chain,so I went with a 170 tire rather than 180. I went 5/8 and centered the rim. some guys go 3/8" offset and let the rim run out of center to the front wheel. they report no i'll afects. but there must be a bit of favoritism when leaning the bike 1 way or the other u would think.going to 5/8 will give u more room at the back and less at the front. if u dont mind altering the frame rails a bit the 5/8 is goodi would borrow a sprocket and mount everything up and see what u think. it will be dif at the back end with each swing arm and rim choise.
hear is mine project.
kzrider.com/index.php?option=com_kunena&...w&catid=11&id=103381

question...

I've reviewed where it was mentioned counter sprocket shims.

I'm assuming this is some kind of washer that goes on before the counter sprocket thus brining it out the thickness of the shim away from the casing towards the frame... Is this correct?

If above holds true, is this a special type of hardened material, specific "shim" or just a regular washer will accomplish the same?

If shim, anyone have a link where to purchase different size shims?

Thanks,

OMR