Are the 500 and 650 valve screws interchangeable? Honda CX500, GL500, CX650, GL650

What’s the difference between the CX500 or GL500 and CX650 or GL650 tappet screws? Can you use one in the other? In a nutshell, no – here’s some comparison photos – 650 valve adjustment screws on the left, 500 on the right:

What are the differences between a Honda CX500 and Honda CX650 valve screw?

Removed:

What are the differences between a Honda CX500 and Honda CX650 valve screw?

500 – ~6mm:

What are the differences between a Honda CX500 and Honda CX650 valve screw?

650 – ~7mm:

What are the differences between a Honda CX500 and Honda CX650 valve screw?

The locking screws differ in thread diameter and height; 650 on the left:

What are the differences between a Honda CX500 and Honda CX650 valve screw?

Different lengths too, at least between these two engines – though one could just be more worn… here is the 500:

What are the differences between a Honda CX500 and Honda CX650 valve screw?

…and 650:

What are the differences between a Honda CX500 and Honda CX650 valve screw?

In terms of part numbers, the 650 screw is 90012-414-000 (eBay) and the 500 screw is 90012-415-000 (eBay). The parts manuals show that the GL500s theoretically used the same screw as the CX500.

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