1. Home
  2. Engines
  3. Harbor Freight Engines
  4. Predator 420 Engines
  5. Carburetors
  6. OEM Carburetor
  7. EC Adjustable Needle Methanol Kit for GX390/Clone Ruixing Carb
EC Adjustable Needle Methanol Kit for GX390/Clone Ruixing Carb
169F-43A390 EC Adjustable Needle Methanol Kit for GX390/Clone Ruixing Carb
Write a Review

EC Adjustable Needle Methanol Kit for GX390/Clone Ruixing Carb

Part Number: 169F-43A390
Online Price: $21.99
EC Adjustable Main Jet for GX390, Predator 420 & 460 Clones
Availability: In Stock.

Send to:

*We'll ask for shipping info at checkout

Description

EC Adjustable Main Jet Kit – Fits Honda GX390, Predator 420, Wildcat 460 & Big Block Clones


Take control of your carburetor tuning with EC’s Adjustable Main Jet, engineered to fit stock carburetors on Honda GX390, Predator 420, Wildcat 460, and other big block clone engines.


Say goodbye to swapping jets and dealing with fuel bowl removal every time conditions change. This adjustable jet gives you precise fuel control with a simple turn of the needle—no tools, no guesswork. Whether you’re tuning for changes in fuel type, altitude, temperature, or humidity, this kit provides the flexibility you need.


Key Features:

  • Replaces 10+ jet sizes with micro-adjustable tuning
  • Designed for stock big block carburetors
  • Easily adjust fuel delivery without removing the bowl
  • Brass needle & nut improve alignment for precise tuning
  • Compact design improves fitment and wheel clearance
  • Ideal for performance engines running methanol


Kit Includes:

  • Adjustable Needle
  • Main Jet
  • Bowl Washer Gasket
  • Low/Pilot Jet

Designed for Pre-calibrated methanol-fueled carburetors.


Whether you're drag racing, karting, or just demand quick and consistent carb tuning, the EC Adjustable Main Jet keeps your engine performing at its best—anytime, anywhere.

FAQ

Q1: What engines does this adjustable jet kit fit?
A: It fits stock-style carburetors on Honda GX390Predator 420Wildcat 460, and other big block clone engines commonly used in racing, performance, and karting applications.


Q2: How does this kit improve carb tuning?
A: The adjustable main jet lets you fine-tune fuel delivery with a simple turn of the needle—no need to remove the fuel bowl or swap jets. It replaces 10+ fixed-size jets with one versatile solution.


Q3: Is this adjustable jet pre-set for methanol or gasoline?
A: This version is pre-calibrated for methanol setups. 


Q4: Will it work with aftermarket carbs or only OEM?
A: It's designed for stock-style big block carburetors, but may also fit certain aftermarket carbs with the same mounting and fuel delivery layout.


Q5: What’s included in the kit?
A: The kit includes an adjustable needle, main jet, bowl washer gasket, and a low/pilot jet—everything needed to install and begin tuning.

Related Items

Recently Viewed Items