SIP PERFORMANCE Main Jets for Carburettors—precisely manufactured by KOSO and ideal for precise tuning.

The Main Jet regulates the fuel flow in every Carburettor and is an essential component of the fuel mixture preparation process. Modifications to engine components or even popular classic car tuning require correctly manufactured jets with modern precision.

Imprecise aftermarket jets from the traditional accessories market are not an option for us. That’s why, at KOSO, we have our own jets produced with the SIP PERFORMANCE label, featuring high manufacturing quality and tight tolerances.

Anyone who has ever tuned a carburettor and couldn’t rely on the stamped sizes knows what this is all about: If it says 75 on the outside, there must be 75 inside. Otherwise, you’ll quickly lose interest in tuning.

Depending on the model, jet sizes increase in increments of two, three, or five. Simply append the corresponding size to part number 40290.

Conclusion: Top quality, high precision, excellent value for the price, and finally back in stock on a regular basis.