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  #1  
Old 05-03-2010, 12:56 PM
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Default leaking overflow from carbs

hi my carbs have started leaking from the over flow pipes only when the engine is running stripped down carbs and cleaned them out.has any body got any info on sorting these out thanx
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Old 05-03-2010, 01:29 PM
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hi my carbs have started leaking from the over flow pipes only when the engine is running stripped down carbs and cleaned them out.has any body got any info on sorting these out thanx
Typical symptom of float needles stuck or not sealing correctly.

Did you set the float heights when you had them stripped down ?
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Old 05-03-2010, 01:55 PM
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the floats are plastic with no bending metal bits to alter set the needle valves in the seats cleaned all but still leaks
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Old 05-03-2010, 01:58 PM
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the floats are plastic with no bending metal bits to alter set the needle valves in the seats cleaned all but still leaks
Unfortunately - sounds like needles or seats are shot and need changing.
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Old 05-03-2010, 02:27 PM
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thanx i will try that
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Old 05-03-2010, 02:30 PM
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any ideas of how to check which carb its coming from
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Old 05-03-2010, 02:39 PM
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any ideas of how to check which carb its coming from
There are two breather tubes - 1&2 are linked, 3&4 are linked.

Try and see which tube the fuel is coming from - that will boil it down to one of two carbs.

The only way I know to check each float needle is to blow in to the fuel inlet and push lightly on the float - you should hear/feel the one that is leaking.
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Old 05-03-2010, 04:07 PM
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when the carbs were off i blow down the brether pipes when pushing the floats they seemed sealed dose this work or dose it have to be through the fuel pipe dose it only go one way i will have ago again tomorrow thanx for you help i know im getting closer
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Old 05-03-2010, 06:51 PM
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It's coming out the tubes that come out of the bottom of the bowls right? Did you try tightening the drain screws? If float needle was leaking, fuel would be leaking up past needles and into motor. Does motor run fine? Try tightening those drains. If that doesn't do it, you may need Orings for the screws.
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Old 05-04-2010, 02:03 AM
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when the carbs were off i blow down the brether pipes when pushing the floats they seemed sealed dose this work or dose it have to be through the fuel pipe dose it only go one way i will have ago again tomorrow thanx for you help i know im getting closer
You blow down the FUEL INLET hoses to test the float seals.

The breather/overflow pipes are open to atmosphere all the time.

cbr900racer77 has a point - and I am curious too as to why the fuel is only leaking when the bike is running.

Are there any other symptoms of this leak ? - Engine runs rough etc ?
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Old 05-04-2010, 02:03 AM
 
 
 
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1100xx, bottom, carb, carberator, carbs, carburetor, cbr, cbr1000f, cbr900, float, honda, hurricane, leaking, overflow, screw, wheel


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