Carby leaking - ATVConnection.com ATV Enthusiast Community



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Old 12-17-2016, 05:40 PM
Weekend Warrior
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Default Carby leaking

I have an old 86 trx250 fourtrax that I have been restoring. The other day I cleaned the carburator out but didnt take anything much apart. When i put it back in and turned on the fuel it all came pissing out of the overflow valve and wouldn't stop. Any help is appreciated.
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Old 12-18-2016, 01:25 PM
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Your carb has a lot of corrosion on it and probably some inside as well. At least I can see some gunk in there just from the pics. Due to age and condition visible in your pics, I would guess the float is sticking or the float valve is just shot. Time for a complete rebuild from the ground up or perhaps due to the condition of your carb a new one might be in order. Pictures make it look like she has endured some excess time outdoors in the weather.
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Old 12-18-2016, 03:29 PM
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You need a rebuild kit, then clean the inside like a Marine cleans his weapon (like your life depended on it) The tiniest spec of dirt can plug up a jet, btw.
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Old 12-19-2016, 02:55 AM
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If you disturb the carb it will often start leaking fuel from the overflow, this is simply some dirt from the pipe or tank which got dislodged and is now stuck to the float needle. Sometimes, if you just turn the tap off and run the bike until the float chamber is empty, when you turn the tap on again it flushes the grit out, and you are good to go. If that doesn't work, you have to remove the float chamber and float, and clean the needle, blowing out the seat with compressed air. You may as well blow the jets out while you have access to them too.
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Old 12-19-2016, 02:52 PM
Weekend Warrior
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Thanks for the help guys. In the end I just took it to a mate who worked for honda for 15 odd years and he cleaned it out. Pilot jet was blocked and float needle and float was being weighed down by enamel off the petrol
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Old 12-20-2016, 11:52 AM
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Sounds about right...


I now use an ultrasonic cleaner for my carbs...I always thought I did an excellent job cleaning them...the color of the water after just 5 minutes in the cleaner has proved me very wrong...even carb dip doesn't compare...
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