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• Fork Spring Lengths, Limits, Part Numbers, Alternatives

Fork Spring Lengths, Limits, Part Numbers, New Alternatives - Honda CX500, GL500, CX650, GL650

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A work in progress! These numbers are all from the relevant parts fiches and factory service manuals, but some look wrong - we will attempt to correct what we can when we get more info.

Please double check any linked products prior to purchase in case of an errant link - Amazon in particular seem to like throwing up lots of non-relevant results...

You may have to scroll to the right to see the rest of the columns for new alternatives depending on your screen size.

Year	Model	Fork Diameter	Long Spring No.	Long Spring Lengths (normal, limit)	Short Spring No.	Short Spring Lengths (normal, limit)	New: Progressive	New: Racetech
1978, 79	CX500	33mm	51402-415-003	461.7mm, 449.5mm	51401-415-003	98.2mm, 90.1mm	11-1109 eBay, AMA
1979, 80	CX500 Custom	33mm	51402-415-003	461.7mm, 449.5mm	51401-415-003	98.2mm, 90.1mm	11-1109 eBay, AMA
1980	CX500 Deluxe (USA)	33mm	51402-415-003	461.7mm, 449.5mm	51401-415-003	98.2mm, 90.1mm	11-1109 eBay, AMA	N/A
1981	CX500 Deluxe (USA)	33mm	51401-470-751	565.2mm, 556.6mm	N/A	N/A		N/A
1981-82	CX500 Custom (USA)	35mm	51402-449-751	503.1mm, 495.1mm	51401-449-751	100.7mm, 96.7mm	11-1108 eBay, AMA	FRSP S2341 FRSP S2534
1981-82	CX500 Custom (AU)	33mm	51402-449-711	?	51401-449-711	?
All Years	CX400 Sports	37mm	51401-MC5-611	458.9mm, 449.7mm	51402-MA6-003	<-- Spacer, not spring
All Years	CX500 Sports	37mm	51401-MC5-611	458.9mm, 449.7mm	51402-MA6-003	<-- Spacer, not spring
All Years	CX500 Turbo	37mm	51401-MC7-003	469.1mm, 455.0mm	51402-MA0-771	<-- Spacer, not spring	11-1100 eBay, AMA	FRSP S2938
All Years	GL500, GL500I	35mm	51402-MA1-003	508.1mm, 493.0mm	51401-449-751	100.7mm, 97.7mm	11-1111 eBay, AMA	FRSP S2341 FRSP S2534
All Years	GL650, GL650I	37mm	51402-ME2-003	466.9mm, 451.8mm	51401-ME2-003	123.6mm, 120.6mm	11-1100 eBay, AMA	FRSP S2938
All Years	CX650 Custom	39mm	51401-ME8-003	498.3mm, 483.4mm	51402-ME9-003	<-- Spacer, not spring
All Years	CX650 Eurosport	37mm	51401-MG0-003	480.5mm, 470.9mm	N/A	N/A		FRSP S2938
All Years	CX650 Turbo	37mm	51402-ME7-003	571.4mm, 560.0mm	N/A	N/A	11-1100 eBay, AMA