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Throttle Shutter Screw for Honda GX390 & Big Block Clone Carburetors
188F-53 GX390/420 Clone Throttle Shaft Screw
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Throttle Shutter Screw for Honda GX390 & Big Block Clone Carburetors

Part Number: 188F-53
Online Price: $0.88
Throttle Shutter/Baffle Screw – Fits GX390 & Big Block Clone Carburetors
Availability: In Stock.

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Description

Throttle Shutter Screw for Honda GX390, Predator 420 & Big Block Clone Carburetors


Secure your throttle plate with this OEM-style throttle shutter screw, designed for Honda GX390-style carburetors, including Predator 420, Wildcat 460, and other big block clones.


This precision screw fastens the throttle shutter (also known as the throttle butterfly or valve) to the throttle shaft inside the carburetor. A proper seal and alignment of the throttle shutter is critical for smooth throttle response and consistent airflow at idle and full throttle.


Note: Each throttle plate uses two screws, sold individually.


Key Features:

  • Secures throttle shutter/butterfly to throttle shaft
  • Precision-fit for GX390 and clone carburetors
  • Helps maintain consistent airflow and idle stability
  • Made from durable steel for long-lasting use
  • Each screw sold individually (2 required per carburetor)


Compatibility:

  • Honda GX390
  • Predator 420
  • Wildcat 460
  • Most GX390-style horizontal shaft clone engines using stock-style carburetors

FAQ

Q1: What does this screw do in the carburetor?
A: It secures the throttle shutter (butterfly valve) to the throttle shaft. This is essential for maintaining accurate throttle control and proper airflow through the carburetor.


Q2: How many screws are needed per carburetor?
A: Two screws are required per carburetor. These are sold individually, so be sure to order the correct quantity for your application.


Q3: Will this screw fit aftermarket carburetors?
A: This screw is designed for OEM-style GX390 and Ruixing clone carburetors. It may fit some aftermarket versions, but we recommend verifying the screw size and thread pitch for compatibility.


Q4: Can I reuse the original throttle screws?
A: Reusing throttle screws is not recommended if they are worn, damaged, or stripped. Replacing them ensures a tight fit and reliable operation.


Q5: Is thread locker needed during installation?
A: Yes, it’s highly recommended to use blue thread locker to prevent the screws from loosening due to engine vibration, especially in high-RPM or racing applications.

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