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EC Briggs Stock Flathead Filter Adaptor
311FA EC Briggs Stock Flathead Filter Adaptor
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EC Briggs Stock Flathead Filter Adaptor

Part Number: 311FA
Online Price: $29.99
311FA CNC Filter Adapter for Briggs 5HP Raptor – WKA/IKF Legal
Availability: In Stock.

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Description

311FA Filter Adapter for Briggs 5HP Raptor Carburetor – 2.5" Air Filter Mount


The 311FA Filter Adapter is engineered to mount a 2.5" ID air filter directly to your Briggs & Stratton 5HP Raptor carburetor, offering a high-quality intake solution for classes where velocity stacks are not permitted.


Made from CNC-machined 6061-T6 aircraft-grade aluminum, this adapter is built for durability, precision fitment, and consistent performance. Designed to comply with WKA and IKF stock class rules, it provides a legal and efficient alternative to high-flow velocity stacks.


While we recommend using velocity stacks in any class where they are allowed, the 311FA is the ideal solution when rules require a standard filter adapter. Be sure to consult your rulebook before ordering.


Key Features:

  • Fits Briggs 5HP Raptor Carburetors with a 2.500" OD filter flange
  • Mounts a 2.5" Inside Diameter Air Filter – commonly used in kart racing
  • CNC Machined from 6061-T6 Aluminum – lightweight, strong, and corrosion-resistant
  • Racing Legal Design – Compliant with WKA and IKF stock class regulations
  • Includes All Installation Hardware – no extra parts required


Why Choose the 311FA Filter Adapter?

For racers and builders in classes where velocity stacks are prohibited, the 311FA delivers the performance and reliability you need. Its Mega-Flow high-velocity design optimizes intake performance within rule limitations, ensuring your setup is both legal and competitive.


Compatibility:

  • Engine: Briggs & Stratton 5HP Raptor
  • Carburetor: OEM Raptor carb with 2.500" OD flange
  • Filter: Fits 2.5" ID air filters (check your specific filter for fitment)
  • Class Use: Legal in WKA and IKF stock classes

FAQ

1. What is the 311FA Filter Adapter used for?

It’s used to mount a 2.5" ID air filter onto a Briggs & Stratton 5HP Raptor carburetor, offering a compliant intake solution in racing classes where velocity stacks are not allowed.


2. Is the 311FA adapter legal for WKA or IKF kart racing?

Yes. The 311FA is specifically designed to meet WKA and IKF stock class rules, making it a legal option for competitive kart racing where high-flow stacks are banned.


3. What is it made from?

The adapter is CNC machined from 6061-T6 aircraft-grade aluminum, ensuring durability, light weight, and a precision fit.


4. What carburetor and engine does this fit?

It fits the Briggs & Stratton 5HP Raptor carburetor with a 2.500" OD flange, commonly used in kart racing.


5. What kind of air filter will this accept?

It is designed to fit 2.5" inside diameter (ID) air filters. Be sure to confirm filter sizing before purchase.


6. Does it come with installation hardware?

Yes, the 311FA includes all necessary hardware for a complete and secure installation.

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