Carburetor Jet Drill Set – 20 Pc Selected Sizes, Factory Resharpened Carbide, 1/8" Shank CDS-102

Carburetor Jet Drill Set – 20 Piece Selected Sizes

This 20-piece factory resharpened solid carbide micro drill set is intended for careful carburetor jet tuning, checking, and resizing work. The set includes one drill each of 20 selected sizes from .0135" through .071", covering a useful range for brass carburetor jets and other small fuel-metering parts.

Common applications include automotive carburetors, motorcycle carburetors, small engines, kart engines, scooters, radio-controlled engines, and carburetors from brands such as Holley, Rochester, Carter, Mikuni, and Walbro.

Included Sizes – 20 Pieces Total

Includes 1 piece each of these selected sizes:

• .0135" — 0.35 mm / #80
• .0160" — 0.40 mm / #78
• .0200" — 0.50 mm / #76
• .0240" — 0.60 mm / #73
• .0250" — #72
• .0260" — 0.65 mm / #71
• .0280" — 0.70 mm / #70
• .0290" — 0.75 mm / #69
• .0315" — 0.80 mm / 1/32"
• .0330" — 0.85 mm / #66
• .0350" — 0.90 mm / #65
• .0360" — #64
• .0370" — 0.95 mm / #63
• .0380" — #62
• .0390" — 1.00 mm / #61
• .0610" — 1.55 mm
• .0650" — 1.65 mm
• .0670" — 1.70 mm / #51
• .0690" — 1.75 mm
• .0710" — 1.80 mm

Specifications

• 20 pieces total
• 20 selected drill sizes
• Factory resharpened solid carbide drills
• Standard 1/8" shank, also known as 3.175 mm
• 1.50" overall length
• Packaged in an indexed plastic storage case
• Reference image shows drill style and dimensions only; actual included sizes are listed above.

Common Uses

• Brass carburetor jet resizing
• Main jet and pilot jet tuning
• Small engine carburetor work
• Motorcycle, scooter, kart, and RC engine carb tuning
• Carburetor jet work for Holley, Rochester, Carter, Mikuni, Walbro, and similar carburetors
• Checking, matching, or stepping up small drill sizes

Factory Resharpened Solid Carbide Value

These are factory resharpened solid carbide drills, offering performance comparable to new drills at a lower cost. They are professional-grade micro drills with standard 1/8" shanks, intended for stable, accurate drilling setups where rigidity and precision matter.

Unlike lightweight hobby-style wire drill assortments, these are solid carbide micro drills with full 1/8" shanks and are packaged in an indexed storage case for organized size selection.

Use note: Solid carbide drills are precision tools that require a stable setup. For best results, use a pin vise, drill press, milling machine, micro drill fixture, or other controlled holder that keeps the jet square to the drill. Avoid handheld electric drills, side pressure, bending, or forcing the drill.

Important Jet Tuning Note

Drilling a carburetor jet is a permanent modification. Increase size gradually and do not skip too far at once. For the most exact fuel-flow work, remember that jet flow can depend on more than the hole diameter alone, including the entry shape, exit shape, and finish of the jet.

Frequently Asked Questions

Are these new drills?
No. These are factory resharpened solid carbide drills, offering performance comparable to new drills at a lower cost.

Are these for enlarging brass carburetor jets?
Yes. These drills are commonly used for careful resizing of brass carburetor jets, including main jets and pilot jets.

Will these work for Holley, Rochester, Carter, Mikuni, and Walbro carburetors?
They are commonly used for carburetor jet tuning on many carburetor types, including Holley, Rochester, Carter, Mikuni, Walbro, and similar carburetors. Always verify the required jet size for your specific carburetor and tuning setup before drilling.

How many drills are included?
This set includes 20 drills total: 1 piece each of 20 selected sizes from .0135" through .071".

Is this a continuous numbered drill set?
No. This is a selected-size carburetor jet drill set. The included sizes are listed above and shown in the product size chart.

Are these solid carbide or carbide tipped?
These are solid carbide micro drills, not carbide-tipped drills.

Can I use these by hand?
They can be used carefully in a pin vise or other controlled holder, but carbide drills are brittle. Keep the drill straight, use light pressure, and avoid side loading.