Honda cb250n carbretta overflow

[Rowey]

I've got a problem with my cb250n superdream. When ever the fuel tap is on, it overflows from the breather pipe at the bottom of the carbretta.

I thought this may be a problem with the float sticking, so I took it apart and cleaned and oil it, but it hasn't solved the problem.

I'm new to bike maintenance, so I may not have cleaned the float as I should.

Any help would be appreciated

[Blau Zedong]

[stinkwheel]

Could be the float sticking. Try tapping the outside of the float bowl with a lump of wood and seeing if the flow of fuel stops.

Something I had happen with my 125 superdream was that a small sprung pin located in the top of the needle valve got stuck in. This caused the carb to overflow. Freeing off the pin solved the problem.

If you're in there again, check that pin is moving, check the floats aren't punctured and carefully inspect the pointed end of the needle valve and the needle valve seat for any dirt or signs of damage/wear (use a magnifying glass).
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Rowey]

Thanks stinkwheel I'll try tapping the Carburettor when it starts to leak, see if that helps.

I had the top part off the other day, the bit with the plunger and needle, don't know what it's called, and gave that a good clean and oil. But it didnt help...

I'll keep you updated, hopefully i'll have my hayne's soon.

[Odie]

Needle valve seats are buggered, take them out (they are under the float) and see if you have a ridge on the pointy bit (the seat) if you have and they are the rubber seat variety then you have to buy new ones, if they have a brass seat then clean it with some "duraglit".
"Duraglit" is used for cleaning brass, copper, silver etc and thus can remove scratch's and polish the metal item at the same time.
The more you use it the dirtyier it gets and the better it gets till you wear it away.
It can also be used for cleaning scratch's on watch len's, spectacles etc.
This is and old trick and i have used it many times myself.
Hope it helps
Odie
____________________
You are so ugly when you were born the doctor said "I?m gonna drop it, if it falls is a rat, if it flies is a bat."

[ZaphodBeeble]

Another thing to try, although not very tasty, is to blow down the fuel pipe into the carb while pushing up on the float to see if the float needle is sealing properly. It's what I usually do as a quick test.

Z
____________________
Current bike: VTR1000F Firestorm. Previous: Firestorm (written off) - XJ600 Divvy - NSR125 - DT125 and a load of offroaders.