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1999 yz125 carb

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My '99 has been spitting out gas nonstop when the bike was off but the gas was on, so I took the carb off cleaned it and put it back on thinking the neetle and seat were gumed up, but I didn't see anything unusual the first time, so I put it back on thinking I fixed it and is still pissed gas out, so I took it off and took a closer look, removed the seat (in the carb not the thing you sit on) and took one pick at the o-ring and it fell off in pieces. I found my problem that the gas was bypassing the neetle but is this normal for the o-ring to dry up or should I be worried? All answers accepted

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15 years of gas sitting on an O-ring will do that. A rebuild kit on eBay is cheap and replacing all of the gaskets is never a bad thing.

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