SOHC.co.uk Forums > CB500/550
Carburettors
Sesman:
This bloke.
deltarider:
It's not without hesitation I present a link to the first of six videos on Youtube dealing with the assembly of a set of Honda CB500 carbs. Hesitation, because I cannot recommend separating the carbs from the rack. Anyway, out of curiosity it's been done by a German, who took his carbs completely apart, to even the smallest parts. I've so learned about the why of all the components and why Honda went to such great length, to arrive at an ultimately reliable and robust rack of carbs. Marco's carbs are the 649A type, we had in continental Europe, but the videos equally deal with the 627B, 022A, 069A and 087A variants, which after all only differ in jetting. The content even applies to the carbs on the CB350/400F models.
I don't know if the German language is an obstacle, but Marco's voice is pleasantly quiet, modest and lacks the Hi guys hysteria we have to endure in other vids. Although - again - I cannot recommend separating the carbs, the videos are certainly worth watching. Marco is a pleasant person and just watching his work, gave me a sort of Zen experience. Excellent stuff for a rainy afternoon. Enjoy.
https://www.youtube.com/watch?v=iXD7F4q72M4
It's the first of six and in the serie no detail has escaped Marco's attention.
If you're interested, you may also watch his vids dealing with the disassembly. I know the language can be a problem, but his vids are outstanding, the best I've come across. If you urgently need to know what is said at a particular moment, I may be of help.
Laverdaroo:
Thanks for the links but like Ken, I have no issue with taking them off the rack and in a million bits to get a thorough clean. As long as all the same bits that came off the individual carb, go back on that carb there's really no issue. Its not a hard job, just one full of concentration. I only asked as i might ship this set out as time might be a problem because we might be moving and if i'm gonna start it, I have to get it somewhere near before we move. Im not into shuffling stuff about half done, thats how bits get lost!
deltarider:
--- Quote from: Laverdaroo on October 21, 2021, 10:15:06 PM ---[...] I have no issue with taking them off the rack and in a million bits to get a thorough clean. [...]
--- End quote ---
And that's my point. At least you're open about it: your desire for 'a thorough clean'. My objective was and is to inform others, there are no technical reasons to take carbs thus far apart. Most of us here are amateurs and may mistakenly conclude it's a good procedure to overhaul carbs.
There is also this. Clean and - no doubt - polished carbs, will only be a temporary achievement, good for a concours presentation. Carbs wil be dusty and dull again in no time, even more after a few rides. I've posted that link (there are six on the assembly and three about the disassembly), because Marco clearly demonstrates there's no technical need to do, what he has done. Nonetheless his vids contain good info on how these carbs work. In the process he shows how to arrive at a perfect initial sync and adresses an error on p.8 (Fig. 5) in the Shop Manual CB500-550.
Sesman:
All good stuff. I fully stripped mine for a meticulously clean and inspection. I replaced some parts with genuine Honda parts at some significant expense and reassembled without any dramas, other routing the fuel pipes the wrong way. Nobody on the forum spotted the error in my original pics, or they were too polite to mention it.
I felt it was well worth the effort and I now know exactly what’s in them and that they are as good as they can be. I was fortunate as my carbs were completely virgin without any signs of previous work. I’ll be doing it again, probably, as I want to get maximum use out of my US cleaner and I’d like to complete the job with a hard chromed link bar.
One question for all: My 1977 F2 carbs had yellow passivate finish to some components. Was this true of all CB500/CB550 carbs?
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