Yamaha Bolt P/Ns, how do I decipher?

[Kevin Werner]

The bolts listed below are the rear drum brake stay bolts. One on the drum and one at the front of the swing are. I have one but I don't know which. How do I tell by looking at the part number?​

BOLT​

90109-08374-00​

by Yamaha

BOLT​

90109-08338-00​

 

[GLJ]

The one in your pic goes to the front of the swingarm.

 

[GLJ]

The one to the rear looks like this.

 

[Kevin Werner]

The one to the rear looks like this.
View attachment 242733View attachment 242734

Thank you.

 

[5twins]

But ..... there were two different ones used. Early bikes used a shorter one because their stamped steel brake torque arm was thinner, See post #11 here .....

https://www.xs650.com/threads/650-rear-drum-brake-plates.51046/

 

[Max Midnight]

This is what you asked for....
Plus explanation of the part number system.