SOHC.co.uk Forums > CB500/550
Carb settings for a 4 into 1 exhaust.
simonster:
I'm just rebuilding the carbs on my 72 500k1 which I think at some point in the past has been raced due to additional crudely welded rear set hangers. I bought it in a sorry state and I'm hopefully on the home stretch on a full nut and bolt cafe look rebuild which I started properly in February and has taken up many pleasurable hours since. I currently have the carbs split and would like to put them back to standard if possible, although I'm not sure if they will need jetting to suit the exhaust. All the carbs have the following fitted:
Needle 273004 with clip second notch from the top.
Main jet 100
Slow jet 40
Float valve 1.8
My aim is to gain motoring utopia, that is to say good power with optimum mpg..!! Pics will follow on this build from start to finish when i get the carbs fitted. These and the clocks to finish the build so nearly there. Cheers for any advice.
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simonster:
My research shows that the main jet and slow jet are standard, just can't find anything about the needle or the difference with mine and 272304 which is also used on the 500k?
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florence:
I think mine has 110 main which was grim with motad but once I changed to the laser pipe it started to run with more gusto.
needle adjustment will just depend on plug colour, set it how you think best.
simonster:
I think I will stick to the jets and settings as they are and see how she runs. Cheers Florence
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motad_uk:
am I being slow here?- what exhaust are you running? certainly if its a road legal it should run fine on standard jets
you should only need to run larger jets on a "not for road use" system or any of the noisy horrors pretending to be road legal!
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