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Old February 19th, 2020, 12:08 PM   #1
woodchipliz
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Leaking Carb

Hi everyone

When i turn on the petcock gas starts leaking out of one of the small holes.I circled it in the picture. Any ideas?

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Old February 19th, 2020, 01:20 PM   #2
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MOTY - 2018, MOTM - Nov '17
Hi,

Is your petcock vacuum-operated? If so, it's broken because petrol shouldn't flow until engine is cranking and generating vacuum.

Also your float-valves aren't sealing. They should stop flow into carbs when float-level is reached.


Most likely you need thorough carb restoration and replacement of worn rubber bits like O-rings, float-valves and seals.
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Old February 19th, 2020, 02:32 PM   #3
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MOTM - Nov '18, Mar '17
you've circled a main air correction jet, rising fuel level is sneaking outta there....a runaway float valve.... seal not sealing, could be due to many reasons. But yessir, @DannoXYZ correct...carb service is certainly called for. And within the service replace ALL orings, rail seals and float valves.
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Old February 19th, 2020, 04:57 PM   #4
woodchipliz
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Although it seemed to operate properly when i cleaned the carbs last night it was in fact the float valve.
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Old February 19th, 2020, 05:06 PM   #5
woodchipliz
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@DannoXYZ I believe the petcock was vacuum-operated however i bypassed that feature by removing the spring behind the diaphragm,gas wasn't flowing when trying to start the bike . I saved the spring in order to fix that issue properly.
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Old February 19th, 2020, 05:07 PM   #6
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@ducatiman "main air correction jet" Thanks ive been looking for the name.
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Old February 19th, 2020, 09:59 PM   #7
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Quote:
Originally Posted by woodchipliz View Post
Although it seemed to operate properly when i cleaned the carbs last night it was in fact the float valve.
Yup, you may notice when assembling that there's some jiggling play with float valve. Rubber hardens over time. Inspect rubber tip under magnifying glass and you will see that tip may no longer be conical in shape. Sometimes, there's ring-shaped depression where it was seated. With these irregular shapes and jiggling, sometimes tip won't seal and you get overflow.

Best to replace all rubber parts. Will need to separate carbs to replace fuel-rail O-rings.
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