There is an o-ring underneath the brass part(seat) that the float needle goes in and seals off the flow of gas coming in when the float is at the set level . Those o-ring get hard and crack , usually from age and certain gas formulas . They will allow gas to bypass the needle and overfill the bowl . That would be first go-to item to replace , even if it "looks" ok , and install a Viton version that can handle fuel , especially ethanol , better than the std , Buna-N o-ring that is in there now .
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'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
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