Oil leaking out of hole in side of head – Honda CX500, GL500, CX650, GL650

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Oil leaking out of the hole in the side of the head on your Honda CX500, GL500, CX650, GL650 or other twisted twin variant?

Here's what to do when there is oil leaking out the hole in the side of the head of your Honda CX500, GL500, CX650, GL650

That hole is the drain hole for the spark plug recess. The most common cause of an oil leak here is a missing, damaged or misaligned round rubber gasket in the rocker cover near the top of that hole.

Remove the spark plug caps so that you can take off the rocker cover:

Here's what to do when there is oil leaking out the hole in the side of the head of your Honda CX500, GL500, CX650, GL650

Remove the bolts on the rocker cover with a 10mm socket (different bike to the first couple of pics!):

Here's what to do when there is oil leaking out the hole in the side of the head of your Honda CX500, GL500, CX650, GL650

Here's what to do when there is oil leaking out the hole in the side of the head of your Honda CX500, GL500, CX650, GL650

Here the rocker cover has been turned upside down to show the rubber gaskets:

Here's what to do when there is oil leaking out the hole in the side of the head of your Honda CX500, GL500, CX650, GL650

You can grab a new one from eBay US, eBay AU, eBay UK, Amazon and CMSNL.

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