Non stock sprocket/chain replacement. Help

I am pretty sure my rear wheel and swing arm are not stock. I want to replace both sprockets and chain. I do not know if its a 630 or 520 on it now, but really doesn't matter does it? I am going to go to 520 if I can find it all. Do you think I should take this sprocket off and take it to a Kaw dealer or do you have an idea if I can order a KZ sprocket and it will work?


I need to go take a better picture

The chain should have the numbers stamped into a side plate either 630 or 520.

Handsome bike!

630 chain measures 3/4" between pin centers.

530 chain measures 5/8" between pin centers.

520 chain measures 5/8" between pin centers.

630 and 530 are same 3/8" width.

520 is 1/4" width (smallish imo for a KZ900).

Am guessing it's either 630 or 530.

Would get chain and sprockets from Z1E. Has everything needed, plus excellent advice, very reasonable pricing, and best service on the planet.

Possibly consider making a xerox copy of the rear sprocket which could be faxed to Z1E.

Good Luck!

"Handsome bike!"... No doubt, beautiful!

Most probably a 630, possibly a 530 but seems old setup configuration via imaging, hard to say.

Question, why 520?
I ask this for there are numerous posting & debates about this so what are you truly going to gain...

At least in a 530 setup, tensile strengths in new technologies I get but 520....

Chain & rear sprocket assortment of colors I get but on that purdy ass black bike only a few colors would match the theme anyways...

Just don't forget the math for gearing desires...
630 tooth count example... Stock 15 tooth cc sprocket.
15 / 5 x 6 = 18 tooth in 530 or 520.
Same for the rear math...

If needed, follow the link to JTSprockets for rear sprocket conversion template (bolt pattern) matches....
www.jtsprockets.com/52.0.html?&L=0

Finding a 520 output shaft spline match will be difficult so if you find a source, please share with others...

Ok, I'll shut up now....

OMR

I meant to say 530. I am a life long dirt bike rider, so 520 just came out of my fingers on accident.

I am going to measure it thanks to your fine peoples information and see whats on it.

I suspect its a 630. I may stay with 630, I just want a black or natural color chain, nothing fancy on this bike... I think a color would look stupid/cheap.

If I get good pics of the sprocket, do you think you could tell if a stock sprocket would fit? Any ideas on how to proceed with the sprocket?

Follow the link to Z1 if 630 configurations....

www.z1enterprises.com/catalog.aspx?pid=KZ900-A4-1976-MP0

Stock KZ900 gearing is 15/35 for the sprockets.
OEM Chain is 92 link but with that swing arm, unknown extension.... Count the number of links you presently have...

Patton has already provided you the Pitch & width measurements you can make to confirm which size is presently installed...

OMR

I counted 100, probably buy one a few extra just to make sure I didn't count wrong and cut where needed.

thanks for the z1 link, I will try to match up sprocket. you guys are great ! KZ rides on