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Replacing the oil pump O-rings and reassemble the pump - Honda CX500, GL500, CX650, GL650

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Firstly we're looking at the O-ring joining the pickup pipe and the oil pump body:

It's one of two different sizes depending on which model of oil pump you have;

Model	Part No.	Alt. Part. No.	Size	Other compatible size(s)
CDI CX500s	16997-357-003 (eBay US, eBay AU, Amazon, CMSNL)	91320-MJ6-003 (eBay US, eBay AU, CMSNL)	11.8x2.4	?
TI CX500s + GL500s	91302-377-000 (eBay US, eBay AU, Amazon, CMSNL)	-	15x2.5	?
CX650 + GL650	91302-377-000 (eBay US, eBay AU, Amazon, CMSNL)	-	15x2.5	?

Grab the two flange bolts to attach the pickup pipe to the oil pump body - part number 95700-0601400 for all models:

Grab your torque wrench - we set ours to 10Nm:

The bolts take a 10mm socket:

Make sure the O-ring is seated properly and not pinched out one side. Bolts tightened:

The other O-ring is on the front of the oil pump:

The part number for this O-ring is the same across the CX500, GL500, CX650 and GL650 engines (naturally aspirated, anyhow):

Model	Part No.	Size	Other compatible size(s)
CX500, GL500, CX650, GL650	91301-268-020	14mm	?

Don't forget that there's a dowel that sits inside the O-ring:

The dowel is part number 15155-300-000.

On the CX650 and GL650 oil pump the pickup screen is a separate part to the pickup tube, and has an O-ring of it's own - part number 91363-MC7-004, which is 15.3 x 3.5mm. More on this part of the assembly later:

We also cover the front O-ring replacement in the front cover installation article. If you're looking for how to assess the CX650/GL650 oil pump, check out the procedure here.