SOHC.co.uk Forums > CB500/550

Pan screw

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Nurse Julie:
400/4's didn't have spring washers Ken. But, the kits I sell fit the 400/500/550. Having sold 218 kits on the forum, Facebook and other platforms with no complaints, I think they're just fine. More importantly, we fit them to all our own carbs as well, so I know they are fine. Most restorers are more concerned in the JIS dimple than anything else to be honest.

Oddjob:
Not knocking the kit Julie, just asking why not supply the springs washers for the bowls if Honda fitted them, If not needed for the 400 then the buyer can just omit them. I also understand why you supply the lengths Honda fitted, as I said over time the threads corrode/get muck on and then a longer screw doesn't want to go down these threads and of course you can't know if the buyer has the taps required to clean them up.

As for the JIS thing, I find the actual opening in the screw isn't that different from a normal crosshead, it's shallower is all,  it's the actual screwdriver that makes the biggest difference, the very tip is ground off on a JIS screwdriver, this tip is left on on a Phillips screwdriver and because of this it stops the screwdriver from going into the screw as deep, this means less contact on the sides and that's why they round off JIS screws. JIS screwdrivers fit Phillips screw just fine, but the reverse just isn't true as we have found out.

Nurse Julie:
Not on about the opening for the screwdriver Ken, it's the little recessed dot by the side that restorers want, it denotes they are original JIS, not Philips and not SS.

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Oddjob:
I'm aware of the significance of the dot Julie, I'm just pointing out that it's pretty stupid to compromise a rebuild just for the sake of a punch mark.

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