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Throttle Fine Regulator Spring for Honda GX390 & Big Block Clone Engines
188F-15008-A GX390/420 Clone Throttle Fine Regulator Spring
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Throttle Fine Regulator Spring for Honda GX390 & Big Block Clone Engines

Part Number: 188F-15008-A
Online Price: $1.99
Throttle Fine Regulator Spring for Honda GX390 & Big Block Clone Engines
Availability: In Stock.

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Description

Throttle Fine Regulator Spring for Honda GX390 & Big Block Clone Engines


Ensure smooth and responsive throttle return with this fine regulator spring, designed for use on Honda GX390 and big block clone engines such as Predator 420 and Wildcat 460—especially in kart racing applications.


Originally part of the governor system, this spring is commonly repurposed in performance setups as a fine-tuning throttle return spring. It plays a crucial role in aftermarket top plate and throttle linkage kits, providing consistent tension and improved control.


In competitive karting, safety is key. Many tracks require dual throttle return springs to prevent runaway engines if one spring fails. This spring meets that need—offering a reliable, lightweight solution for racers and builders alike.


Key Features:

  • Compatible with GX390-style and big block clone engines
  • Used in aftermarket throttle linkage and top plate kits
  • Functions as a fine regulator or throttle return spring
  • Ideal for racing applications where dual return springs are required
  • Helps prevent wide-open throttle failure if one spring breaks
  • Durable spring tension for precise throttle response


Perfect for kart racing, safety compliance, and throttle control refinement.

FAQ

Q2: Is this compatible with Predator 420 and Wildcat 460 clone engines?

A: Yes, this spring fits most GX390-style big block clone engines, including Predator 420 and Wildcat 460.


Q3: Why do some tracks require two throttle return springs?

A: For safety. If one spring fails, the second prevents the throttle from sticking open, which could cause the engine to run uncontrollably.


Q4: Can this spring be used with aftermarket top plate kits?

A: Absolutely. It’s commonly used in conjunction with aftermarket throttle linkages and top plate assemblies to ensure precise throttle return and control.


Q5: How do I install the throttle return spring?

A: Installation varies depending on your top plate and linkage setup, but it typically attaches between the throttle arm and a fixed bracket to provide spring tension when the throttle is released.

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