Which replacement radiator cap to use and where to find it? Honda CX500, GL500, CX650, GL650, Turbos

Before using this site please read the site disclaimer. Also please note that any links provided may be part of an affiliate programme (viz. eBay, Amazon) which helps support the site as I will earn a commission when visitors make a qualifying purchase.

Here are some brands and part numbers for the Honda CX500, GL500, CX650 or GL650's radiator cap. It's a recovery-type cap - there's an expansion tank behind the motor that the coolant flows into when it expands and it's retrieved as the bike cools down, and the recovery caps allow this to happen. Turbo owners should look in the next section of the page.

Manufacturer	Part No.	Sources	Pressure	Notes
CPC	543-13	eBay AU	13psi	Made in Australia
Halfords	HRC608	?		UK
Repco	RC50-13	Repco stores	?	Australia
Honda	19045-PA0-014		?	Superseded part no.
Honda	19045-634-003		?	Superseded part no.
Honda	19045-449-770		?	Superseded part no.
Honda	19045-692-003		?	Current part number

Honda CX500 Turbo and CX650 Turbo Radiator Cap Alternatives and Sources

Here's some notes for the Turbo owners as to which radiator caps have been found to work and where to find them.

Manufacturer	Part No.	Pressure	Notes
Stant	10229	eBay US, Amazon	13psi	CX500T
Napa	703-1445	eBay US	13psi	CX500T
Sankei	KH-C13	?	88kpa, 0.9kg/cm³	CX500T
Honda	19045-MC7-003			Not readily available. CX500 Turbo
Honda	19045-MG9-003			Not readily available. CX650 Turbo

If you're done here, go back to the cooling system page.