NOVINO 40PCS Carburetor Jet Kit for PWK / Keihin CVK / OKO – Main & Slow Jet Set

Upgrade your carburetor tuning with the NOVINO 40PCS Carburetor Jet Kit. Crafted in solid brass, this jet set is designed for PWK, Keihin CVK, PE types, OKO, KOSO, Stage-6, Polini, and more. Whether you ride a scooter, ATV, or kart powered by a 125cc–250cc GY6 engine, this kit helps you dial in fuel delivery for a more consistent mixture across idle, mid-range, and high RPM. The result is smoother starts, steadier idling, and a throttle response that feels predictable in real-world riding conditions.

The precision brass jets in this kit are machined to tight tolerances, offering reliable threads and repeatable metering. You can rely on uniform metering across a wide range of sizes, reducing guesswork when you tune for different fuels or elevation changes. The included sizes cover a broad spectrum of tuning scenarios, so you can fine-tune your carburetor without swapping components from other brands. The brass construction also offers ease of soldering or cleaning with standard solvents used in maintenance routines.

What is included

• Slow Pilot Jets: sizes 32, 35, 38, 40, 42, 45, 48, 50, 52, 55; thread size 6 x 0.75 mm; overall length 28 mm
• Main Jets: sizes 100, 105, 108, 110, 115, 120, 125, 130, 135, 140 (PWK 21mm-34mm); thread pitch 4.7 x 2.5 mm; nut diameter 5.7 mm; thread length 5 mm

• Main Jets (continued): sizes 155, 158, 160, 162, 165, 168, 170, 172, 175, 178 (PWK 28mm-42mm); nut diameter 6 mm; included lengths ensure reliable alignment

Compatibility and fit notes: This kit is intended for PWK, CVK, PE-type carbs and brands such as OKO, KOSO, Stage-6, and Polini. It is not compatible with CV, VE, or CVK carburetors above 3 cm in bore size. The thread sizes match common on-carby metric standards for straightforward installation.

Benefits in practice

In practice, selecting the right jet sizes translates to a more predictable fueling map. You may experience crisper mid-range acceleration, steadier idle during cold starts, and a more linear throttle feel at higher RPM. The kit provides options to experiment with different fuels, elevations, and riding styles, without altering your engine hardware. It does not guarantee specific results, but it offers reliable options for tuning control.

Who is this for

This set is ideal for riders tuning PWK, CVK, or PE type carburetors in scooters, ATVs, and kart builds powered by 125cc–250cc GY6 engines. It is a practical upgrade for hobbyists, shops, or anyone building a tuned or stock setup and seeking broader metering choices.

Pro tip: keep track of which jet pair you used and under what conditions; small differences can accumulate into a noticeable driving feel over time.