Reply To: Quick question about my Comet 250 2005 carburettor.
Hello, the orings are installed by mikuni japan when they make the parts , hyosung just puts the carb together to make twin carbs.
However, the oring isn’t critical. The bike will be okay without it. It does help guarantee extra seal between the Jet Holder and Main Jet. But a tight clean jet won’t leak , just don’t over tighten it as brass is very soft
Regards!