Billet Velocity Stack for PWK 21–30mm Slide Carburetors – 2.5" Air Filter Adapter

Upgrade your airflow and filter compatibility with EC’s Billet Velocity Stack, designed for PWK 21mm to 30mm slide carburetors. This precision-machined velocity stack adapts your carburetor to accept standard 2.5-inch (63.5 mm) air filters, offering improved performance, smoother airflow, and enhanced filtration options.

Perfect for mini bikes, go-karts, and high-performance small engine builds, this stack not only boosts throttle response but also ensures a snug, secure fit for cone-style filters.

Key Features:

• CNC-machined billet aluminum for strength and heat resistance

• Allows PWK 21mm–30mm slide carbs to run 2.5-inch air filters

• Tapered design improves airflow velocity and reduces turbulence

• Lightweight yet durable—built for track and off-road abuse

• Sleek finish to complement race-ready carb setups

Dimensions:

• Outer Diameter (OD): 2.5 inches / 63.5mm

• Inner Diameter (ID): 1.960 inches / 50mm

• Always verify carburetor dimensions for proper fitment

Whether you're tuning a high-RPM mini bike or dialing in your go-kart for race day, this billet velocity stack helps you get more from your PWK carb setup—both in performance and compatibility.

FAQ

What does this velocity stack fit?

This billet velocity stack is designed to fit PWK-style slide carburetors from 21mm to 30mm that feature a standard round spigot. Always measure your carb to confirm compatibility.

What size air filter does it support?

It adapts your carburetor to accept 2.5-inch (63.5mm) air filters—common in performance cone-style filters used in karting and mini bike builds.

What does a velocity stack do?

A velocity stack improves airflow by reducing turbulence at the intake, which can enhance throttle response and power, especially in mid-to-high RPM ranges.

Will this velocity stack increase performance?

Yes, when paired with a properly tuned carburetor and a performance air filter, it can enhance airflow, improve throttle response, and increase top-end performance.

What material is it made from?

This stack is CNC-machined from billet aluminum, offering excellent durability, heat resistance, and a precise fit.