SOHC.co.uk Forums > CB350/400

Carb sync

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royhall:
Does anyone have a simple and effective step by step way of syncing the carbs on a 350/4. The manuals all describe slightly different ways of doing it. They appear to be very sensitive to each other, a quarter turn on one seems to disturb the others a fair bit, so I'm chasing my tail with it. All was very simple on the 750's, but not on this. Think I may have missed something somewhere. Cheers.

kevski:
I have also found that the 350s and the 550s are very hard to get spot on, my 350 is to within 1cm hg and then fine tune using the air screw, i have always found it easier on the bigger bikes and more modern bikes, i think it's just a case of plugging away and using either number 2 or 3 as the bench mark carb.

royhall:
On the 750 I usually take the bottom of the air box off and the air filter out before syncing. Is it required on the 350/400 to take off the airbox manifold first, as its a royal pain to get out. Or can I get away with just taking the filter out. Cheers.

K2-K6:
I don't have a reference for the tolerance on these smaller fours, but the 750 is given as 40mm (1.6 in) Hg.

hairygit:

--- Quote from: royhall on December 14, 2016, 08:38:27 PM ---On the 750 I usually take the bottom of the air box off and the air filter out before syncing. Is it required on the 350/400 to take off the airbox manifold first, as its a royal pain to get out. Or can I get away with just taking the filter out. Cheers.

--- End quote ---
Not sure that's such a good plan Roy, the idea is to set the motor up to run properly as it will be on the road, removing the air filter to set them will be wrong when the filter is refitted, as with the filter out, all carbs get a straight supply of air, and when the filter is put back there will be resistance to airflow, but some carbs get a fractionally higher flow than others, messing up all your work! :o

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