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Stock Throttle Shaft Assembly for Honda GX390 & Big Block Clone Carburetors

Part Number: 188F-55
Online Price: $6.95
Stock Throttle Shaft Kit – Fits GX390 & Clone Engine Carburetors
Availability: In Stock.

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Description

Stock Throttle Shaft Assembly for Honda GX390/Big Block Clone Carburetors


This OEM-style replacement throttle shaft assembly fits most Honda GX390-Style Big Block Clone carburetors, providing reliable control over your engine’s throttle.


The complete throttle shaft assembly kit includes:

  • Precision-machined throttle shaft
  • Throttle shutter (butterfly valve)
  • Mounting screws for secure installation


Designed to meet stock specifications, this assembly ensures smooth throttle response and optimal carburetor performance. Ideal for repairs or carburetor rebuilds on GX390, Predator 420, Wildcat 460, and similar Big Block Clone engines.

FAQ

Q1: What does this throttle shaft assembly include?
A: The kit includes a stock-style throttle shaft, throttle shutter (butterfly valve), and mounting screws for proper installation in your carburetor.


Q2: Will this fit a Predator 420 or Wildcat 460 carburetor?
A: Yes, this throttle shaft assembly is compatible with most GX390-style Big Block Clone carburetors, including those used on Predator 420, Wildcat 460, and similar engines.


Q3: Is this compatible with Ruixing carburetors?
A: Yes, it fits most stock Ruixing and other clone carburetors built to Honda GX390 specs. Always confirm measurements before purchasing.


Q4: Do I need any special tools for installation?
A: A small screwdriver and thread locker (optional but recommended) are usually sufficient for installing the throttle shutter screws securely.


Q5: What symptoms indicate I need to replace my throttle shaft?
A: Common signs include sticky or unresponsive throttle movement, excessive shaft play, vacuum leaks, or visible wear on the shaft or shutter.

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