offset rear sprocket

I'm more of a four wheel mechanic than two, but I'm attempting an old kz1000 build. I've got a 77 kz1000 motor and an old all souls plunger frame. I put the old kz rear wheel in and the rear sprocket needs to be offset about a 1/2" to be perfectly aligned. A spacer won't work because there is only about an 1/8" of thread oustide the nuts on the studs and I can't use bigger studs because there is a tight clearance between the end of the studs and the frame. I can't seem to find any place that has offset rear sprockets for kz wheels does anyone know of a place? What is the normal tolerance for aligning sprockets? Any other ideas?

I have personally only seen spacers that require longer bolts for the sprocket. That's the route I had to go because I couldn't find an offset sprocket for the rear. You'd think that someone would make something like the offset front sprockets that are everywhere, but I haven't seen one yet. Maybe someone will chime in with some good news...

If I understand you right, you need to move the rear sprocket outboard to line up with the front sprocket. If thats the case, could you make a spacer and replace the studs with longer grade 8 Allen bolts? Or, can you modify or replace your front sprocket and make up the difference on the rear?

Found an ad for your frame!
hondachopper.com/CB750_Frames.htm
scan down the page

Post edited by: Fossil, at: 2007/11/26 00:16

Post edited by: Fossil, at: 2007/11/26 00:18

i am pretty sure you can get an offset countershaft sprocket, which i would think would be easier for you especially since you have clearance issue in the back.

I'm not sure what you mean by offset countershaft sprocket. The Rear sprocket needs to move outboard 3/8" but I can't use a spacer because it will require longer studs. What will happen if I just run it like it is?

You really should have the sprockets aligned or they will wear out really quickly. You might be better off moving the entire wheel over.

What type of sprocket is on the front? Sometimes there is a factory spacer behind the front sprocket, or a built in shoulder on the back side of the sprocket. You can remove the spacer or order a flat sprocket that would move the chain line inward on the front.

Ironnads: Why not make longer studs? Buy high grade bolts and use them in place of the too-short stockers.

I can't use longer studs because there is only about 1/4" clearance between the current studs and the frame.

It's a bit Heath Robinson but you can weld two sprockets together. Cut the centre out of the outer one and the teeth off the inner one. You will need to re-harden it afterwards.

Here's a front I did a long time ago:





Post edited by: Lorcan, at: 2007/12/12 12:42

Can you post a pic of what your trying to do. Allot of us have gone through this process and it's a pain, but several people are right here. If your trying to align the rear sprocket with the front you will need to use a spacer(they do not make an offset rear sprocket). The only reason I could think of not having any clearance is if your using different hub than the kz one. Otherwise you need to use a spacer and get longer bolts.

i got mine from these guys, www.americanclassix.com/specialorder.html
contact them, explain what you need and they have most that your looking for, takes around 3 weeks and will cost 100$+shipping.

Can you email me some pics of what you trying to do or post them. This would help a lot. I have some lift over part I may not use.

Rebelgears,
made some sprockets for my KZ1000 0ff set front 5/8 19th/525th and the rear was molded from a 630 down to 525 chain size about 3/8 down from the top off the sprocket then comes out to a 630 this gives me a little more room on both sides of the chain/tire and bike frame inner, rear sprocket a 40th 525 from top of the sprocket in ward down is a 630 mold size sprocket. He did it to my specs and it come out very good. Very please with his work.I using GS1100 swing with 17"x6"3/4 wide PM rim the rear tire is 180/60x17" ZR17 W 168 miles in hour tire Dulop is almost 7.5 wide. The chain is a EK zzz type 525 tensile strength at 10,500.

Doug, is his name tell him James sent you. pricing was very good to this helps.
Tell him what your trying to do.
www.rebelgears.com/

Also check with a local machine shop to.
But would need pictures to see what your really trying to do. PS Doug did some spacer for me to for a few other bikes.
email at jagcompany@aol.com

It sound like you need a off set rear sprocket made.
With the stud holes set back in side some. Because your studs are not long enough.

I talk to Doug at Rebelgears his number is 1-931-788-1617.

Post edited by: jagrider, at: 2008/01/09 14:25