Collection: Carburetor Jet Drill Bits & Drill Bit Sets

Shop carburetor jet drill bits and drill bit sets for careful jet sizing, cleaning, matching, and tuning. These precision micro carbide drills are useful for working with small brass jets found in Holley, Rochester, Carter, Mikuni, Walbro, and many other automotive, motorcycle, small-engine, scooter, ATV, go-kart, and RC carburetor applications.

Our pre-configured carburetor jet drill sets include practical ranges of small drill diameters commonly used when checking jet openings, matching replacement jets, cleaning restricted passages, or gradually enlarging a jet. Using closely spaced drill sizes helps make controlled adjustments instead of removing too much material in a single step.

Each set comes in a sturdy plastic case to help keep the drills protected, organized, and easy to identify. A size index is included for quickly comparing drill diameter, jet size, and tuning steps.

Carburetor Jet Drill Set Basics

These precision micro drills are intended primarily for careful work on small brass carburetor jets and similar soft-metal fuel-metering parts. They may be used for controlled jet-size changes, but jet modification should always be performed gradually because an enlarged jet cannot be returned to its original size.

• Useful for Carburetor Jet Tuning
  Suitable for working with main jets, pilot jets, idle jets, air bleeds, and other small carburetor metering passages where minor changes in opening size can affect fuel or air flow.
• For Many Carburetor Applications
  Commonly used for automotive, motorcycle, scooter, ATV, small-engine, go-kart, and RC carburetor work, including applications involving Holley, Rochester, Carter, Mikuni, Walbro, and other carburetor manufacturers.
• Small Increment Size Selection
  Pre-configured drill sets provide closely spaced micro sizes for increasing a jet opening gradually instead of jumping several sizes at once.
• Solid Carbide Precision Drills
  Carbide drills are hard, rigid, and capable of producing clean, accurate holes when properly supported. They are best used in a drill press, pin vise, micro-drill fixture, or other controlled setup that prevents bending and side pressure.
• 1/8" Shank (3.175 mm)
  The common 1/8" shank fits many small drill chucks, collets, rotary-tool accessories, and precision drilling setups.
• Short 1.50" Overall Length
  The short overall length helps reduce flex and improve control when working with very small drill diameters.
• Size Index Included
  Helps identify the included drill sizes when comparing drill diameter, jet size, or gradual tuning steps.

Common Uses

• Carburetor jet tuning and careful jet enlargement
• Checking, matching, or cleaning small brass jet openings
• Holley, Rochester, Carter, Mikuni, Walbro, and other carburetor jets
• Automotive, motorcycle, scooter, ATV, and go-kart carburetors
• Small-engine and RC-engine fuel-metering work
• Older carburetors where replacement jets may be difficult to find
• Precision drilling in small brass and soft-metal metering parts

Important Use Notes

• Best suited for brass carburetor jets and other small soft-metal metering parts.
• Use light pressure, keep the jet square to the drill, and increase the opening gradually.
• Do not skip multiple drill sizes when tuning; it is easy to remove too much material.
• Carbide micro drills are hard but brittle. Avoid bending, side-loading, hand wobble, or forcing the drill.
• Drilling a jet changes its physical opening but does not guarantee an exact flow rating.
• For precise fuel-flow work, final sizing may require jet reaming or flow testing because jet flow can depend on more than the drilled-hole diameter alone.