[kennedy759]

it was next to the rear sprocket on my 71 cb175 it has saw teeth on it

 

[tbpmusic]

I don't believe I've ever seen a part like that on any Honda.....

 

[Richard_Pitman]

It's an old circular saw blade.

Some bodger has used it as a shim to take up play ???

 

[Alex jb]

Ichiban moto badassness!