How to replace the oil pump O-rings and reassemble the pump – Honda CX500, GL500, CX650, GL650

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

Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

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

ModelPart No.Alt. Part. No.SizeOther compatible size(s)
CDI CX500s16997-357-003
(eBay US, eBay AU, Amazon, CMSNL)
91320-MJ6-003
(eBay US, eBay AU, CMSNL)
11.8×2.4?
TI CX500s + GL500s91302-377-000
(eBay US, eBay AU, Amazon, CMSNL)
15×2.5?
CX650 + GL65091302-377-000
(eBay US, eBay AU, Amazon, CMSNL)
15×2.5?

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

Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

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

Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

The bolts take a 10mm socket:

Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

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

Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

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

Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

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

ModelPart No.SizeOther compatible size(s)
CX500, GL500, CX650, GL65091301-268-02014mm?
Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

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

Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

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:

Here's how to replace the O-rings on the Honda CX500, GL500, CX650 or GL650 oil pump

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.

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