SOHC.co.uk Forums > CB350/400

Carb Jet sizes

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ogri211:
I'm just about ready to overhaul my carbs, my bike had a Motad 4 into 1 fitted from what I can remember Motad olways advertised that you don't need to up your jets. I have managed to procure a standard set of headers which I am getting rechromed and I have got a Marshal deep tone tailpipe which is what I wanted as it is the same as what I had in 1982 ( my profile picture) does anyone have any ideas of what size of jets I should fit as for obvious reasons I don't want to be pulling the carbs on and off.

Bryanj:
With the correct screwdriver and smallish hands you can get the floatbowls off in situ and swap jets, I would try standard first as i fitted a marshall to a 550 and it ran fine on standard

ogri211:
Unfortunately, my hands are rather large but im going to put capheads on the carb boals when I do them o the should be easy to take off I will go with the standard jets first and take it from there. Thanks for your advise. 

hairygit:

--- Quote from: ogri211 on March 13, 2018, 08:54:08 AM ---Unfortunately, my hands are rather large but im going to put capheads on the carb boals when I do them o the should be easy to take off I will go with the standard jets first and take it from there. Thanks for your advise.

--- End quote ---
Be very, very careful not to do capheads  too tight, the carb body is really rather fragile where the screws go in, threads strip for fun, and the entire screw area can snap off if you don't tighten them gradually and evenly. Sad to say I've seen it happen a few times, but these days you can't just nip to a breakers and get a full bank of carbs from a running bike for a tenner! (There some good things about the 80's eh?)

andut:
I would agree with Bryan's caution with those float bowl screws - you may want to check how good the threads are in the carb castings and consider helicoiling them all before fitting the carbs if you're expecting to be changing jets or float heights as part of your tuning.  Cap heads will definitelty make removal / refit of the bowls easier once the carbs  are on the bike, but go steady when tightening them up !

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