SOHC.co.uk Forums > CB350/400

carb float bowl drains

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mattsz:
Hi guys -

I've mounted my carbs to the bike just to fill them with fuel to see if all the bowls are filling and to check for leaks - yes, and none... so far.

Noob question: is opening the drain screws supposed to drain the fuel through the overflow hoses, or should the fuel just run out at the drain screws?  I'm guessing the latter (which mine are doing) is correct.  Sure would be nice and easy if the fuel drained out the hoses, much easier to collect!

philward:
Its the latter so your carbs are draining as they should - couldn't drain out of overflow pipes as the brass overflow tube in the bowl is above the level of the fuel level in the bowls. Drain screws and overflow tubes are 2 different purposes.
Just thank your lucky stars the fuel isn't coming out of overflow tubes!

mattsz:
Thanks philward!  It's just too bad the drain screw openings don't somehow lead to the overflow hoses for ease of draining.  But then I guess if you find fuel coming out the hose(s), you don't know if it's an overflow problem or a drain problem...

I did find it challenging to connect the temporary fuel supply and get the fuel flowing with all of my fingers crossed!  ;D

mattsz:
Anybody have a particular routine and/or piece(es) of equipment they use to quickly and easily drain the carbs?  I just had a terrible time using different size funnels and pieces of plastic bent into troughs to try to direct the fuel flow from the drains to a container - instead of it draining all over the crank cases...

robvangulik:
I've got an indestructable glas teacup that fits nicely under the carbs, just large enough to hold the contents of 1 floatbowl :)

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