UMA CARBURETOR PWK V3 – 28MM – UNIVERSAL

The UMA Racing PWK V3 Carburetor (28mm) represents the latest evolution in UMA’s legendary carburetor lineup. While the V2 focused on raw performance, the V3 introduces significant refinements to the internal fuel delivery system and the exterior finish, making it the “Gold Standard” for 150cc–175cc street and race builds.

The 28mm size is widely considered the perfect “all-rounder”—offering enough airflow for high-RPM power without losing the snappy low-end response needed for city riding.

Key Upgrades in the V3 Series

• Revised Fuel Path: The V3 features an updated internal circuit that improves the transition from the pilot jet (low speed) to the main jet (high speed), virtually eliminating the “dead spots” or “bogging” often associated with large carburetors.

• Redesigned Float Bowl: The bowl is shaped to maintain a more stable fuel level during hard cornering and heavy acceleration, ensuring the jets are never “starved” of fuel.

• Enhanced Chrome Slide: The semi-flat “D-shaped” slide features a newer, lower-friction coating. This makes the throttle feel exceptionally light and prevents the slide from sticking due to heat expansion.

• Premium Aesthetics: The V3 comes with a signature darkened, high-grade finish that is more resistant to corrosion and fuel staining than previous versions.

Core Features

• Integrated Power Jet: Just like the V2, the V3 includes a Power Jet that provides extra fuel at Wide Open Throttle (WOT), acting as a “safety net” to prevent engine overheating at top speeds.

• Quick-Change Bowl Nut: Allows for lightning-fast Main Jet changes without dismantling the entire carburetor.

• Quad Vents: Four overflow tubes ensure the carburetor can “breathe” regardless of the bike’s lean angle or terrain.

Factory Initial Setting

Why choose the 28mm V3?

The 28mm is the most popular size for a reason:

1. Versatility: It is small enough to run perfectly on a stock motorcycle, yet flows enough air to support a 63mm Big Bore Kit.

2. Fuel Velocity: Because the bore isn’t excessively large, the air moves through the venturi very quickly, resulting in instant throttle response the moment you “blip” the gas.

3. Stability: The V3 is notoriously easier to “dial in” (tune) than generic 28mm carburetors, meaning you spend less time turning screws and more time riding.

Installation Tip

When switching to a PWK-style carburetor, ensure you check your Intake Manifold diameter. Most stock manifolds are too small for the 35mm outer diameter of the PWK 28mm intake spigot. You will likely need a UMA 28mm Rubber Intake Manifold to complete the install.

FAQs

Is 28MM good for street use?
Yes, it offers a strong balance of response and usability.

Does it need tuning?
Yes, proper jetting is recommended for best performance.

Is it universal fit?
Yes, but intake manifold and cable compatibility should be checked first.