SOHC.co.uk Forums > CB350/400

Leaky carbs

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AndyD:
Hi all,
I know it's a common issue the carbs leaking through the overflow and sure enough the poor old gal suffers this indignity as well after refurbing the carbs.
Everything cleaned and reassembled fine with new O rings etc.
Spent a few happy hours setting the float levels having read many topics on here - ended up using the method with carbs on side and very slightest pressure on the float pin.
First time on test she dribbled happily so took apart again and re-cleaned the float pins etc. and checked float levels again.
Put back on test and again 2 carbs started dripping straight away - 1 quite a constant flow, the other a slower drip.
I'm guessing this means the float pins / valve may need replacing so i wondered what opinions were on different replacements available (trying to keep spend down so cheaper the better!).
Any views welcome
Cheers,
Andy

Johnwebley:
Could be as simple as sticking float

Give each of the leaky carbs at solid tap with a plastic screwdriver handle.
and when we get chance to ride them for longer.
Put some Redex cleaner in the tank.

Help to keep the carbs free

Sent from my SM-A750FN using Tapatalk

TrickyMicky:
Before spending any dosh on parts, one problem which bugged me a couple of times is the spindle pins which the floats pivot on. They can get gunged up with infrequent use, so remove pins and very gently give them a polish with some VERY fine wet & dry, and see if that helps. Stay healthy, Mick.

florence:
might sound crazy but carefully inspect the brass pipe in the float chamber.  I have had different Hondas develop a hairline crack in this tube.  No matter what your float height, petrol will leak out.  It's very easily missed and makes one suspect the float or the valve.  Also make sure the floats float and are not filling up with petrol.

AndyD:
Thanks all
I tried tapping bowls but no effect
Took pins and floats off and checked all move freely
Checked the brass tubes and all seem fine
Suspect the float valve so will try swapping the fast leaking one to a different carb so hopefully will show if that’s the problem.
Cheers
Andy

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