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9-Piece Main Jet Kit for GX200/GX390 Stock Carburetors
9-Piece Main Jet Kit with Open Jet Case
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9-Piece Main Jet Kit for GX200/GX390 Stock Carburetors

Part Number: PK-MJ-K
Online Price: $27.99
9-Piece Main Jet Kit for GX200, GX390, Tillotson PK, Ruixing Carbs
Availability: In Stock.

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Description

9-Piece Main Jet Kit for GX200 / GX390 Stock Carburetors – Hyaui, SP, Ruixing, Tillotson PK Compatible


Fine-tune your engine's fuel delivery with our 9-Piece Main Jet Kit, designed for compatibility with popular GX200 and GX390 stock-style carburetors, including Hyaui, SP, Ruixing, and Tillotson PK series (PK-1A, PK-1B, PK-3A). Whether you're dialing in performance for racing or adjusting for altitude, this jet kit gives you the range you need for accurate carburetor tuning.


Kit Includes:

  • 9 Precision-Machined Main Jets:
    • Sizes: .034, .035, .036, .037, .038, .039, .040, .041, .042
  • Laser-etched size markings for easy identification
  • Compatible with most GX200/GX390 OEM-style carburetors


Stock Jet Reference:

  • GX200 (Typical Stock Jet): .028"
  • Tillotson PK-1A / PK-1B: .039"
  • Tillotson PK-3A: .032"


Recommended Starting Points (General Tuning Guide):

Jet Size

Setup

.036 – .037

Large header with muffler – 196cc / 212cc

.038 – .039

Large open header (no muffler) – 196cc / 212cc

Note: Final jetting may vary based on your engine’s combination, elevation, ambient temperature, and humidity. Always start rich and tune leaner for optimal performance.


Fits the Following Carburetors:

  • Hyaui GX200/390 Style
  • SP Clone Carbs
  • Ruixing GX200
  • Tillotson PK-1A, PK-1B, PK-3A
  • Other GX200/GX390 stock-style carburetors


Why Choose This Main Jet Kit?

This kit is essential for any small engine tuner or kart racer looking to unlock performance and dial in the air-fuel ratiofor maximum efficiency and horsepower. Whether you're running a stock 196cc or a mildly built 212cc engine, having this range of jets allows you to adapt to different tracks, pipes, and weather conditions.

FAQ

Q1: How do I know which jet size to use?
A1: Start with a jet based on your exhaust setup (.036–.039 is common), then test and tune by reading the spark plug and monitoring engine response. Adjust as needed for conditions like elevation and temperature.


Q2: Will this work on a Predator 212 carb?
A2: These jets are designed for stock-style GX200/GX390 carbs, not the stock Predator 212 carburetor. However, if you’re running a Tillotson PK or clone-style carb on your Predator, this kit will work.


Q3: Are the jet sizes marked?
A3: Yes, each jet is laser-engraved with its size for easy identification.


Q4: Do I need to re-tune my carb every time I race?
A4: If you race in varying conditions (different tracks, weather, or altitudes), re-tuning with different jet sizes may be necessary to maintain optimal performance.

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