running rich

[hondagee]

Hi, This is my first post and I could use some advice please. My CB250 is running rich and the plugs get really sooty but it starts and runs ok. Is there a way I can weaken the mixture? Cheers.

[garyd]

Check the air filter is clean ,then you can alter the air/fuel mixture on carb,small screw ,sorry not familiar with your carb
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[.]

A worn needle jet and jet needle can cause an over rich mixture, and is something that should be checked if the bike has covered a high mileage.

You may wish to take the option of setting the float height to the maximum figure which will give you a weaker mixture.
For instance if the manual advises 14-16mm then set the height at 16, don't forget to check that float halves are both square and level.

[Ariel Badger]

Is the choke full disengaging? A dry and rusty cable or linkage could cause problems.
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[hondagee]

Thanks everyone, I will try all these options. Keep safe. Geoff.

[Blue_SV650S]