SOHC.co.uk Forums > CB350/400

Oil drain plug size

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Sprocket:
Is there a variation in oil drain bolt sizes?

Bought a washer online described for F0/77, took out leaky dowty style washer, plugged hole with finger, struggled to get old washer off plug one-handed, eventually 7 year old mini-me helped, but then realised the new washer I have is way too small to go on. Reassembled and washed (thankfully unsullied) oil off my hands and scratched head.

Mine is an early engine. I can only think the bolt sizes changed, or someone has already mullered my sump and it's a bigger bolt in there.

Deano400:
Should be 12mm for all years as far as I know.

Trigger:
As Deano said, all are the same at 12mm  ;)

Sprocket:
Cheers  :-[ Oil out then, investigate what on earth has been done on my sump. Sigh.

Laverda Dave:
There may not be a problem with your sump. I bought a new sump bolt with a magnetic tip online for my 400/4. When I came to fit it I thought the thread pitch looked incorrect so I matched it up against my old bolt to find it was too coarse! Had I fitted it without checking first I would have stripped the sump thread!
There are an awful lot of parts advertised as fitting our bikes that dont! I had a similar issues when I bought a s/s caliper bleed nipple, a carb rebuild kit, bulbs, brake pistons etc........retailers on ebay in particular just say parts fit to shift stock.
My local Honda dealer keeps the sump washers in stock as they use so many of them.
Does your existing sump bolt have a 17mm socket head?

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