SOHC.co.uk Forums > CB500/550

Carb jet size

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deltarider:

--- Quote from: Sesman on November 13, 2024, 09:49:05 AM ---I’m with Delta: start with 100/38,  assuming you are running standard exhausts and air box?

--- End quote ---
The air intake can indeed make a difference, the exhaust... mwah... on these relatively tame engines, not so much. Therefore all suppliers of aftermarket exhausts back then advertised that no rejetting was required: Marshall, Dunstall, Jamo, all. I remember just one exception: the Austrian brand Sebring had two options: a popular standard one and a racing version that did need rejetting.

Sesman:
I agree delta, but the question hasn’t been answered.

I tend to agree aftermarket exhausts sourced from reputable companies will probably produce reasonably acceptable results. As mentioned previously my Dekelvic 4:1 works fine, but whether its comparable to standard I really couldn’t say.

Murf:
My plan is to have the bike in standard trim, it was standard when I bought it with filter and air box plus a very good set of original 4 into 4  exhausts and silencers. The exhausts could be copies  of course as  I have no idea how to tell the difference.

After strip down and  a spell in the ultrasonic cleaner the carbs and all the parts have come up very well and are in surprisingly good condition. There appears to be very little wear on any of the moving parts. Is it still possible to get genuine Keihin jets for these carbs, DS has the 100 jets but I am guessing they are copies.

Nurse Julie:
If your exhausts are original, they will be stamped HM323, if they are aftermarket, they should still have the 323 but no HM in front of the numbers. That's assuming you have the original style system fitted.

Murf:
Thanks I will have a look, they are stored in the garage roof so might take a while to get around to it.

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