750K Fuel Tank Identification

[philward]

I'm just going to have a spare tank/side panels done in Candy Ruby Red for my K2 (because its my favorite colour) - I will keep my original Planet Blue set as well. The tank I have is the later LH tap tank and I need to find a tap.
I see from searching taps for sale that they seem to be the same upto K4 so assume there's something different on K5/6?
Question is how can I identify what tank I have (so I can buy the right tap) if there is a difference in the K3/4 and K5/6 tanks?

[hairygit]

K5&6 use the same tap as the 750F1, but don't buy an F2 one as they are a smaller thread. Sadly F1 taps are available, but generally twice the price of the earlier K taps.https://www.davidsilverspares.co.uk/CB750F1-(Single-overhead-cam)/part_7030/

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[Bryanj]

What is the diameter of the thread boss on the tank as i have a couple of pattern taps hanging about.

[philward]

Thanks Hairy - should have just looked at tank! just got the tank out of storage in loft and can clearly see the difference - the threaded male boss - thanks

[Trigger]

You could try R1 Pete >>> https://www.ebay.co.uk/itm/Honda-CB-750-Four-K3-K6-PETROL-TAP-16950-341-671/153259190762?epid=1413705364&hash=item23aef5a9ea:g:7CgAAOSwnCdb6uT4:rk:34:pf:0

[philward]

What is the diameter of the thread boss on the tank as i have a couple of pattern taps hanging about.

Bryan, must have been typing message when you posted - just checked and its M20 X 1.5
Thanks

[Bryanj]

Sorry mine are m18 but try putting m20 petrol tap into fleabay

[philward]

Although this doesn't state M20 - it says 18.5mm 'ID' - do you think its the right one?
https://www.ebay.co.uk/itm/Honda-CB750K-CB750F-Gas-Tank-Petcock-Fuel-Cock-Valve-16950-341-671/173280154978?epid=20018319026&hash=item28584d5562:g:-NQAAOSw5IFa2lkx:rk:4:pf:0

[philward]

For anyone who's after a petrol tap for the later K and F models, just got one of these that fits a treat and less than £30 psted from America
https://www.ebay.co.uk/itm/Honda-CB750K-CB750F-Gas-Tank-Petcock-Fuel-Cock-Valve-16950-341-671/173280154978?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649