EBC HJK27B Mikuni 4/042 Hex Main Jet Kit – 54 Pieces

The EBC HJK27B main jet kit is designed for Mikuni carburetors that use 4/042 hex-style main jets. The kit includes 54 brass jets, with two pieces each in sizes 240 through 500. Each jet measures 11.5 mm overall, with a 6.5 mm hex body and 5 mm thread length. Jets are clearly marked, pin-gauge checked, and flow calibrated according to the stamped fuel-flow size.