SOHC.co.uk Forums > CB750

CB750 K6 fuel tap repair kit

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Ricardo1500:
I've bought a new tap, when i fit it I'll investigate possibilities for the repairing the old one but now the nice weather is here i didn't want to be stuck with a failing, leaky tap.

taysidedragon:

--- Quote from: Treve on April 05, 2026, 10:55:49 AM ---Halo everyone.
I hade mine K6 fuel tap apart last week. The critical part in this is the small plastic cone with hole that can get scratched on its surface and leek. This must be a typical piece to be made by a decent good 3D-printer. Careful measurement and CAD drawing should give us access to spare parts for this one too. I am not at all knowledgeable in this technology but have seen amazing 3D prints.
Just a thought.
Anders

--- End quote ---

I'm sure that you're right. The plastic or nylon cone could be printed in the right, petrol-proof material, or cast/machined. A good project for someone with the skills and access to machinery.

Johnny4428:
I might be wrong, (has been known) but someone on here has already tried a repair by making the small plastic cone shaped bit with limited success. Maybe depends on how good the 3d printer is perhaps. Sorry can’t remember who it was.interested to see if someone had success in this area. Could certainly sell them.😜

honda-san:
I seem to recall that internally the K6 fuel tap is very similar to that used on the 400/4 - ie a plastic cone shaped bit which can indeed wear and therefore not fully shut off the fuel supply to the carbs when tap is in the off position.
IF the tap is leaking to the outside world, as happened with one of my 400/4's, that can be cured by replacing the o-ring between the plastic cone and outer plate. Wish I could remember the o ring size, but way back when I did not tend to make a note of such things. That particular 400/4 tap is still in use more than 20 years after changing the o-ring, and still with no external fuel leak; it does however not shut off fully, allowing a VERY slow feed of fuel into the float bowls - barely a thimble full over a 4 month lay up this past winter. 

hondacb750fourk6:
You would be better off buying a new one off David Silvers as that’s what I did with my K1 or try Julie on here she has a lot of Honda parts or try the bike jumbles like Kempton Park as there used to be a lot of jap parts there

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