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1967 CB450K0 Black Bomber Rebuild - By Royhall
AshimotoK0:
Must admit ...not honestly studied it in any depth Roy .. I just went on what the FB gurus told me :-[ .... My own 1st instinct was to simply fit a spring that was far too stiff for the rubber diaphragm to deflect enough under the high vacuum to open the cut-off valve. This wasn't really an option though because the diaphragms on my 500T carbs were not in particularly good nick and I didn't want to spend loads of money on those carbs as I suspected they might never get fitted anyway. Never heard since if they worked OK or not.
Mick Taylor on here got hold of a 2.5k mile only '67 Bomber a few years back and after he balanced the carbs with some flow-meters, he had that bike ran beautifully if I remember correctly. So the 14C carbs can be made to operate nicely, particularly with the Honda UK mod kit that I sold you to cure the 4k flat spot.
royhall:
I have got a set of 450 carbs on the way (not sure which model will see when they arrive) so I am going to strip all the new bits back out of the 500 units to reuse. I will order two genuine seal kits from DSS at some point. Also got an ultrasonic bath coming so I can save having to pay people to do them. Cheeky to ask, but are you still doing your own zinc plating as I could do with some small carb bits doing.
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AshimotoK0:
--- Quote from: royhall on February 19, 2024, 07:35:18 AM ---I have got a set of 450 carbs on the way (not sure which model will see when they arrive) so I am going to strip all the new bits back out of the 500 units to reuse. I will order two genuine seal kits from DSS at some point. Also got an ultrasonic bath coming so I can save having to pay people to do them. Cheeky to ask, but are you still doing your own zinc plating as I could do with some small carb bits doing.
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--- End quote ---
Think I have a load of 450 carb bits I had replated at Allenchrome .. may have spares ... I will check.
royhall:
Thanks Ash that would be awesome.
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royhall:
The replacement 450 carbs have arrived from Germany and don't look in too bad a condition. They are very dirty but should clean up okay. I will give them a good manual cleaning first with a paint brush and cleaner, then a good soak in the ultrasonic should do the trick. Ash, did you find those replated parts that I could buy off you?
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The new carbs are 14H models originally off a 450K1. After a good bit of checking there are a fairly large number of different 450K carbs all with slightly differing internals (and externals). So I have ordered some service kits from 4into1 in the States that are made specifically for the 14H. Failing that I will have no idea if the parts I'm fitting are correct. I am done with experimenting with these carbs and just want a good standard set. I was a bit worried about the right hand carb as the H next to the 14 has been removed with some sort of gouge. But after much checking of 14H pictures on the internet, I am happy that it is correct. There are also other things that indicate they are off the same bike as both carb vacuum bowls have the same rusty cap head screws. Will see how they come up.
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