CHOP CULT HOME
Email Password
Search
  1. #1

    Default Belt to chain final drive conversion information

    Looking for information on how to convert final drive from belt to chain on a 81 cowpie,

    I have purchased appropriate sprockets and a bearing brace. The brace doesnít fit properly Iím going to assume because of the longer shaft.

    Anyone have information on how to do this properly? Is a shaft swap the only way?

    If itís too much work for now, is there a brace to buy to run with an open primary and final belt drive?

    Thanks!

  2. #2

    Join Date
    Dec 2018
    Posts
    1,910

    Default

    I'm assuming you mean the outboard bearing support. I have run into several of them that won't fit because the bolt holes are in the wrong place. I've had them in hand where some holes were half a hole off. Quality control really sucks these days. This is a simple part, no excuse for making parts that don't fit, but here we are. A mainshaft change will not help your problem.

    Jim

  3. #3
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2012
    Posts
    12,226

    Default

    Quote Originally Posted by Sauerkraut View Post
    Looking for information on how to convert final drive from belt to chain on a 81 cowpie,

    Thanks!

    Just curious????? What bike do you have to have a rear belt on an 81??????? A FLT???????

  4. #4

    Join Date
    Dec 2018
    Posts
    1,910

    Default

    Quote Originally Posted by Tattooo View Post
    Just curious????? What bike do you have to have a rear belt on an 81??????? A FLT???????
    That would be a Sturgis, mostly.

    Jim

  5. #5

    Default

    Thanks for the reply Jim, I did indeed have to drill the holes out to fit over the studs but the problem is the area that meets the tranny is not long enough, the brace contacts the nut before it can mate to the tranny. I put some spacers on the studs to help it mate but I’m not happy with that solution.

    Tattoo, it is indeed a sturgis model! It’s a chopper in a starke manufacturing frame but the PO kept the belt drive.

  6. #6

    Join Date
    Dec 2018
    Posts
    1,910

    Default

    With a stock sprocket and stock thin nut with lock plate beneath, you should have clearance. (The stock sprocket & nut assembly does not stand proud of the main drive gear end.)

    Jim

  7. #7

    Default

    I will grab some pictures this afternoon, maybe I got an incorrect tranny sprocket, there is no indent for the nut to sit inside of on this one

  8. #8

    Join Date
    Dec 2018
    Posts
    1,910

    Default

    '80 and up sprocket is flat on both sides, no undercut.

    Jim

  9. #9

    Default

    Quote Originally Posted by JBinNC View Post
    '80 and up sprocket is flat on both sides, no undercut.

    Jim
    Here are some pics, the nut is about 5mm away from touching the brace, and the brace is about 10mm away from touching the tranny. Wrong nut maybe? It’s a James. I’ve got the lock washer with folding tabs behind it.

    Click image for larger version. 

Name:	F82A139F-B5B5-4D18-A020-918E83BFDC37.jpg 
Views:	3 
Size:	99.6 KB 
ID:	105090
    Click image for larger version. 

Name:	E6553E8E-D237-434D-A6D8-A2A37437D750.jpg 
Views:	3 
Size:	78.7 KB 
ID:	105091

  10. #10

    Join Date
    Dec 2018
    Posts
    1,910

    Default

    "Supernut", with seal. Yeah, you can't use that with the bearing support. You need the -36 nut. Also, when replacing a pulley with a sprocket, you need a spacer behind the sprocket that is .06 thick.

    Jim

  11. #11

    Default

    Awesome, thanks for the info Jim I really appreciate it, that should fix my problem.

  12. #12
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2012
    Posts
    12,226

    Default

    Quote Originally Posted by JBinNC View Post
    That would be a Sturgis, mostly.

    Jim
    Awesome, That's good to know........ Didn't a FLT come with a belt in 80 or was that later???? I could go look but you might know............

  13. #13

    Join Date
    Dec 2018
    Posts
    1,910

    Default

    Quote Originally Posted by Tattooo View Post
    Awesome, That's good to know........ Didn't a FLT come with a belt in 80 or was that later???? I could go look but you might know............
    I think the FLT chassis had the enclosed chain with the rubber bellows between the inner primary and the chaincase on the swingarm.

    Jim

  14. #14
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2012
    Posts
    12,226

    Default

    Quote Originally Posted by JBinNC View Post
    I think the FLT chassis had the enclosed chain with the rubber bellows between the inner primary and the chaincase on the swingarm.

    Jim

    I remembered something was odd about them........

  15. #15

    Join Date
    Dec 2018
    Posts
    1,910

    Default

    Quote Originally Posted by Tattooo View Post
    I remembered something was odd about them........
    God, they were a pain in the ass to work on.

    Jim

Share This



Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Log in

Log in