Jet Keihin Main #145 Hex (4/Pkt)

The Keihin Main Jet #145 Hex is a factory-specification fuel metering jet designed for use in Keihin carburettors. The hex-head design allows removal and installation with a standard hex socket, making carburetor tuning and jetting work more straightforward than flat-blade alternatives.

Sold in a pack of four, these jets suit riders who are dialling in fuel delivery across a range of throttle and altitude conditions, or who simply want a set of spares on hand. Keihin jets are manufactured to tight tolerances and are a trusted choice for OEM replacement and performance tuning on motorcycles, ATVs, and other powersports applications.

• Keihin OEM-specification main jet for Keihin carburettors
• Size #145 for precise fuel metering at the rated flow
• Hex-head design for socket-tool installation and removal
• Pack of 4 — suited to tuning sessions or keeping spares on hand
• Manufactured to tight tolerances for consistent fuel delivery

• 4 x Keihin Main Jet #145 Hex

When removing or installing hex jets, use a correctly sized hex socket to avoid rounding the head — do not use pliers or adjustable tools directly on the jet.
Ensure the carburettor bowl is fully drained and the fuel supply is off before removing any jets.
Clean the jet orifice with carburettor cleaner spray and allow to air dry; never use wire or drill bits to clear the orifice, as this alters the calibrated opening and ruins the jet.
Inspect the jet for varnish or sediment build-up during routine carburettor servicing, typically at each service interval or after extended storage.
When re-installing, tighten snugly by hand first, then with a socket — overtightening can strip the soft brass thread in the carburettor body.
Store unused jets in a sealed bag or container away from moisture to prevent oxidation of the brass.
When jetting up or down for altitude, temperature, or airbox/exhaust modifications, change one jet size at a time and test ride to assess the effect before making further changes.
Dispose of old jets responsibly — brass is recyclable.