MIKUNI HEX MAIN JETS 4/PK #640 - 134-8640

The Mikuni Hex Main Jets #640 are carburetor fuel jets sized at #640 and sold as a 4-pack, making the Mikuni hex main jets #640 4-pack carburetor tuning solution the right call for any rider running a build that pushes fuel delivery to its absolute limit on a Mikuni-carbureted machine. That #640 sizing sits at the extreme end of the main jet range, so you're looking at builds with forced induction, significant displacement, or stacked modifications that won't survive on anything smaller. Getting your air-fuel ratio dialed at a size like #640 is crisp compared to chasing a dangerous lean condition across session after frustrating session. Four jets per pack means you won't burn a full tuning day just because you need to step one size in either direction.

• Delivers consistent fuel flow at the #640 jet size for repeatable tuning results.
• Built to Mikuni hex main jet spec so flow rates match factory carburetor standards.
• Fits Mikuni hex-style carburetors for a direct no-fuss installation.
• Keeps your carburetor fuel jetting powersports toolkit stocked with four jets per order.
• Designed for riders who won't accept a rich or lean condition when a jet swap fixes it.

Order the Mikuni Hex Main Jets #640 4-pack today from Dillon Powersports, authorized dealer.