71 CB450 running rich

[cancb550]

I have cleaned and rebuilt carbs with Honda kit. All jets are stock, mixture screw is turned out by 1 turn still getting black plugs. Dry black powdery stuff that wipes off easily.

What else is recommended to check. I recall setting float height to 20mm.

Appreciate advice from experts
Thanks


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[jays100]

Start with the float level, make sure its not too high/low - critical on this bike.
The kicker is if you replaced the brass, the jets, from the ones typically supplied in rebuild kits - their calibration is off. The remedy is to use the float valve and gaskets from the kit, but either reuse a cleaned jet, or buy new from Honda.