SOHC.co.uk Forums > CB500/550
Carb float levels
Sesman:
Hi, Neil.
It is of course possible that the fuel overflow was caused by some debris, now cleared? Stick with it.
Neill C:
Yes. Fresh fuel. When it's not raining I'm going to let the bike sit for a few hours with the fuel on and then to go out for another ride to see of it overflows again. I just can't see what else it can be other than debris. If the float had a hole in it it would have carried on overflowing when I got home so it can't be that. Even if the level in that bowl is incorrect why would it overflow one minute and not the next. Onwards and upwards!
deltarider:
What one interprets as the 'wrong float level', can have several causes.
Debris that prevents the valve to close is one. A floatneedle that sticks in the valve is another.
Correct working order:
1. Tap floatbowl with stump end of screwdriver. If that doesn't help >
2. Remove drainscrew and flush floatbowl by opening and closing the petcock. Collect gas ofcourse.
3. Combine 1. and 2.
If 1 or 2 (or combination) doesn't work, remove floatbowl for further inspection.
Consider 'readjusting the floattang' as the last, the very last option. I never had to do it on no CB Four ever. My method (see above) is a proven and safe method for diagnosis.
Oddjob:
Another possibility is a bent float rod, it turns as the bike is in motion due to all the vibrations etc, as it turns it jams the float so it leaks, eventually the rod turns again and the float becomes free again.
You could try removing the rods and checking them and also polishing them, that's been known to help as well.
You could also make new rods, they sell the brass you need on Amazon.
deltarider:
--- Quote from: Oddjob on March 20, 2023, 02:57:33 PM ---Another possibility is a bent float rod, it turns as the bike is in motion due to all the vibrations etc, as it turns it jams the float so it leaks, eventually the rod turns again and the float becomes free again.
You could try removing the rods and checking them and also polishing them, that's been known to help as well.
You could also make new rods, they sell the brass you need on Amazon.
--- End quote ---
If you mean the swivel pins, on our models they can't get dislocated. Honda carefully shaped the carbs thus, that they stay shielded in the right position. Also our type of floats cannot leak. When maintenance is needed, cleaning the swivel pins is recommended. A little naphtha or WD-40 will do. Do not use anything abrasive. Swivel pins are best removed using your fingernails. If you must use pliers, I repeat must, do not pinch the pin!
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