The main jet is responsible for making exactly the right amount of petrol available for the premixing. If the main jet is changed this primarily affects the middle and upper rev range. We stock the hexagonal main jets in sizes 100-172, for the KOSO/KEIHIN/PWK carburettor and in a set of 5 (100-108-, 110-118, 120-128, 130-138,140-148,150-158) or in a set of 10 (from KOSO, 122-145 and 150-172).
SIP-TIP: Clean the jets with jet cleaner.
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