KTM Mikuni Needle Jet – S-4 – 55431021400

Original KTM S-4 needle jet for the specified Mikuni carburetor, supplied individually.

Part number: 55431021400

Fitment

Listed in the KTM 300 XC-W Six Days (2018) and 250 SX (2018, USA) carburetor fiches. Select by the required S-4 calibration and original carburetor specification. It is a needle jet, distinct from a jet needle; model listing alone does not establish the correct jetting.