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1967 CB450K0 Black Bomber Rebuild - By Royhall
royhall:
Thanks for that Ash. My carbs were done by Matt Harper who cannot now remember what he did. At the time he said he deactivated the valves whatever that means. I had some new genuine 450 carb parts from you that he fitted but don't know if he changed the mixture screws for 450 type. According to the site you sent me the 450 screws don't fit correctly. I don't suppose you can remember what parts you sent me Ash, I know it's years ago. I cant recall what parts there were at all. I may be best just looking for some decent 450 carbs and rebuild those. Do the 500 carbs have springs on the diaphragms, I seem to remember you sending me a pair of those. Before I go any further I think I will have a scan through the photos, it may help.
royhall:
I may have discovered something in the photo's. These are some of the new parts that I got from Ash. They are mixture screws for a 450 that don't fit correctly in 500 carbs. I have a horrible feeling they were fitted at the carb refurb. Could be the smoking gun. That would be nice as they are easy to change. It would also explain why moving the mixture screws appears to make no difference.
Long search in a cold damp lockup coming my way. The old 500T carb parts are in there somewhere. If I can find them I can take one out of the bike to compare.
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AshimotoK0:
The kit I would have sold you Roy was the late 1960's kit issued by Honda UK in Nottingham's Service department to fix a flat spot on the Keihin 14C carbs and this included a return spring for the piston.
It didn't include those air screws and the airscrew on the 500T is totally different from the original 450K0 one.
Please see pics of the Honda UK bulletin and the parts I would have sold you.
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royhall:
Morning Ash. Blimey you have a good memory. I must have got the screws from somewhere else not knowing at the time that they wouldn't work. This is definitely the first investigation into what's happening. I will still have the old parts in the lockup, question is where. If all else fails Silvers do a kit for the 500 for £20.
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AshimotoK0:
Here is the American Honda Bulletin and the parts
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