SOHC.co.uk Forums > CB350/400

CB400F2 - Petrol tap

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Aye Gee 1977:
Ahem! The DIY moulded tapered cock works a bit, but passes a little fuel even when closed.  It seems an odd arrangement to me, insofar as the spring presses the cone out of its house, which can't help. Maybe I have misunderstood how it is meant to work - my cone was a strange shape following its relationship with the blowlamp.

The DIY method works sufficiently well to persuade me it could be done - given sufficient patience and skill.  But in the meantime I have found someone that seems to sell the innards of the fuel tap https://nrp-carbs.co.uk/shop/index.php?route=product/product&product_id=5802

I have ordered a kit.  It's said to be for a a 1975-76 model whereas mine is a 1977 CB400F2.  I'll post an update when it arrives.

Johnny4428:
That’s a pity but good you found a supplier. I’m sure the spring goes between tap and cone to push cone inwards thus tightening a seal.
Of course it will push it away from the seal behind the front plate.

davidcumbria:
Please will you post dimensions of the cone when received. Be great if it also worked in my 550k1 tap .

Johnny4428:

--- Quote from: Aye Gee 1977 on February 12, 2024, 07:57:28 PM ---Ahem! The DIY moulded tapered cock works a bit, but passes a little fuel even when closed.  It seems an odd arrangement to me, insofar as the spring presses the cone out of its house, which can't help. Maybe I have misunderstood how it is meant to work - my cone was a strange shape following its relationship with the blowlamp.

The DIY method works sufficiently well to persuade me it could be done - given sufficient patience and skill.  But in the meantime I have found someone that seems to sell the innards of the fuel tap https://nrp-carbs.co.uk/shop/index.php?route=product/product&product_id=5802

I have ordered a kit.  It's said to be for a a 1975-76 model whereas mine is a 1977 CB400F2.  I'll post an update when it arrives.

--- End quote ---
Just a thought was your refurb kit for a single outlet tap or a double outlet. Don’t even know if there is a difference in the cone configuration?

ka-ja:
 many moons ago, I converted my 400/4 tap into a twin outlet tap, so I would presume the internals are the same, having fitted another 2nd hand "cone" from 400/4bits since the first mod.

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