O-Ring – Needle Jet (Nozzle Main).

If this O-ring is dried out, shrunk or damaged, fuel can pass around the outside of the Needle jet instead of just thru the jets center causing a richer carb fuel mixture.

Fits: XS/TX 650’s (1970-79) with Stock Mikuni BS38 CV Carbs.

Note: O-Ring appears too small but it is correct, install by carefully stretching with pointy needle nose pliers until it just fits over the jet.

Part #48-5020 $1.25 Ea.