NOVINO Carburetor Jet Kit 40PCS for PWK/CVK/PE (30 Main + 10 Pilot) — Brass, Multiple Threads

NOVINO 40PCS Carburetor Main and Slow Pilot Jet Kit provides a complete selection of brass jets to tune PWK, CVK and PE-style carburetors for scooters, ATVs and karts.

This comprehensive kit includes 30 main jets and 10 slow (pilot) jets in a wide range of sizes and thread types so you can fine-tune fuel delivery across different engine setups and carburetor throat diameters. Machined from solid brass, each jet is sized for predictable flow and threaded to fit common aftermarket carburetor brands such as OKO, KOSO, Stage-6, Polini, and Keihin-style PWK/PE/CVK units. The set covers smaller pilot sizes for idle mixture adjustments and multiple main jet threads to accommodate various carburetor models and bore sizes.

Which carburetors and engines will these jets work with?

The NOVINO kit is designed for PWK, CVK and PE-type carburetors used on many performance and replacement setups. It fits a broad range of scooters, ATVs and karts—commonly 125cc through 250cc GY6 and similar engines. Note the kit contains different thread pitches for different jet positions and carburetor throats.

• Compatible brands: OKO, KOSO, Stage-6, Polini, Keihin-style
• Engine sizes commonly covered: 125cc, 150cc, 200cc, 250cc
• Carburetor types: PWK 21–42mm range, CVK and PE variants
• Important exclusion: not for CV/VE/CVK carburetors with bores above 30mm in certain jet sizes

How are the jets sized and what threads do they use?

Jets are supplied in clear numeric sizes so you can swap progressively to reach the desired mixture. This kit separates slow pilot jets from main jets and provides the thread dimensions for correct fitment in the matching carburetor locations.

• Slow pilot jets: sizes #32–#55, thread 6 mm x 0.75 mm, nut Ø 5 mm, length 28 mm
• Main jets (small pitch): #100–#140 for PWK 21–34 mm, thread pitch 4.7 x 2.5 mm, nut Ø 5.7 mm
• Main jets (larger sizes): #155–#178 for PWK 28–42 mm, thread pitch 5 x 0.8 mm, thread length 5 mm
• Clear marking: each jet is stamped/numbered for quick identification during tuning

What practical benefits will I get from using this jet kit?

Having a range of jet sizes on hand speeds troubleshooting and dialing-in mixtures after modifications like air filters, exhausts, or bore changes. Solid brass construction offers corrosion resistance and consistent flow characteristics, making tuning more repeatable and reliable.

• Quickly identify correct jet for idle and full-throttle mixtures
• Reduce trial-and-error downtime during track or field tuning sessions
• Replace worn or damaged jets without searching multiple suppliers
• Aids in matching jets to different engine mods and environmental conditions

Who is this for: This kit is aimed at DIY mechanics, tuners and small-engine enthusiasts who work on scooters, minibikes, ATVs and go-karts using PWK/CVK/PE-style carburetors. It’s useful for workshop owners, weekend racers and anyone who upgrades intake or exhaust components and needs a convenient set of jets to optimize performance and fuel economy. If you require one-off OEM replacements only, verify thread pitch and bore size before purchase to ensure compatibility.