Polini Velocity Stack for PWK carburetors. 50.5mm inner diameter. Inner Diameter: 50.5mm Outer Diameter: 79mm Includes Set Screws; Carburetor Not Included. Universal Fit Polini Velocity Stack for PWK carburetors. 50.5mm inner diameter. Inner Diameter: 50.5mm Outer Diameter: 79mm Includes Set Screws; Carburetor Not Included. Universal Fit
Polini velocity stack 50.5mm – side profile showing bell mouth flare Polini velocity stack 50.5mm – side profile showing bell mouth flare
Polini Velocity Stack for PWK carburetors. 50.5mm inner diameter. Inner Diameter: 50.5mm Outer Diameter: 79mm Includes Set Screws - Carburetor Not Included Universal Fit Polini Velocity Stack for PWK carburetors. 50.5mm inner diameter. Inner Diameter: 50.5mm Outer Diameter: 79mm Includes Set Screws - Carburetor Not Included Universal Fit
Polini Velocity Stack for PWK carburetors. 50.5mm inner diameter. Inner Diameter: 50.5mm Outer Diameter: 79mm Includes Set Screws; Carburetor Not Included. Universal Fit
Polini velocity stack 50.5mm – side profile showing bell mouth flare
Polini Velocity Stack for PWK carburetors. 50.5mm inner diameter. Inner Diameter: 50.5mm Outer Diameter: 79mm Includes Set Screws - Carburetor Not Included Universal Fit

Polini

Polini PWK Carburetor Velocity Stack - 50.5mm Bell

SKU 146-1
$24.00
Shipping calculated at checkout.
Description

The Polini 50.5mm bell mouth velocity stack is a direct bolt-on intake funnel for PWK-style carburetors. The flared bell mouth profile smooths airflow into the carb throat, reducing turbulence and improving throttle response across the RPM range. Includes set screws for a secure, rattle-free fit. Carburetor not included.

  • Bell mouth (velocity stack) style for improved airflow and throttle response
  • Inner diameter: 50.5mm — fits PWK-style carburetors
  • Outer diameter: 79mm
  • Includes set screws for secure mounting
  • Universal fit — carburetor not included
Spec Detail
Inner Diameter 50.5mm
Outer Diameter 79mm
Style Bell Mouth / Velocity Stack
Carburetor Compatibility PWK-style (universal)
Hardware Included Set screws
Brand Polini

 
Product Diagrams
Features
  • 50.5mm inner diameter for PWK carburetors
  • Bell mouth profile reduces intake turbulence
  • 79mm outer diameter
  • Includes set screws for secure fit
  • Universal fit — carburetor not included
Specifications

Inner Diameter: 50.5mm | Outer Diameter: 79mm | Style: Bell Mouth / Velocity Stack | Carburetor Fit: PWK-style | Hardware: Set screws included
Model Fitments

Universal fit for PWK-style carburetors; most 50cc–150cc scooters and mopeds
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