Main Jet hexagon from KOSO for KEIHIN/PWK carburettors - sizes 100-172, as a set of 5 or 10.

The Main Jet provides the right amount of fuel for the premix and influences the mid and upper speed range in particular when making changes.

The range includes hexagonal Main Jets suitable for KOSO, KEIHIN and PWK carburettors in sizes 100 to 172. Practical sets of 5 (100-108, 110-118, 120-128, 130-138, 140-148, 150-158) and sets of 10 from KOSO (122-145 and 150-172) are available. Ideal for tuning the setup and jetting in order to specifically adjust the running behavior and mixture formation.