SOHC.co.uk Forums > CB750

help...leaking overflow...again

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matthewmosse:
On my 500 I always seemed to get away with a stong dosage of redex petrol cleaner for carb engines, added neat to the carbs after running the bike for a few minutes with the tap off. I had to deal with sticky carbs a fair few times, even with the bike as my only transport. a tap with a screwdriver handle sometimes sorted it but I found the redex was more reliable.

daveh:
Check that the overflow tube in the float bowel is not leaking. I found one of mine had a pin hole in it not visible to the eye which was causing the leak from the overflow. New piece of brass tube cut to the appropiate length sorted the problem. But it took numerous carb strip downs before finding the cause.
Dave.

Bitsa (Ralph Wright - RIP):
Hi,
If it acts like mine starts with  the odd dribble here and there, look for it see anything no, scratch head and forget.Bit later over a period of time steady flow.Remove bowl then with a good magnifier see a tiny split in the overflow tube mounted in the bowl.Replace bowl problem gone.If you take the bowl off empty it of fuel put finger over the top of the tube blow into the bottom if split you will hear your breath,air escaping.Hope this helps you.
Cheers
Bitsa

BigAl (Alan):
Hi,

I have the same problem when the bike has been on the side stand for a while. Put the bike on the main stand and run with the fuel tap in the OFF position at tick-over, as the engine starts to fade switch the fuel back ON.
The full movement of the float hinge & fuel inlet normally shifts sticky crap.

Alan

sonsman:
Top tip, had the same issue after leaving my F2 on the sidestand. Put it on the centrestand, fired her up with the tap off and when it started to die switched the tap on and hey presto - no leak. Brilliant!

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