Carburetor YD-MJN Racing Dual Stack 28mm/30mm for MSX125, Pit Bike, ATV

GOOFIT YD-MJN Series: High-Performance Dual Stack Racing Carburetor

Unlock the elite performance of the Dual Stack design. The GOOFIT YD-MJN Series is a top-tier racing carburetor engineered for riders who demand the absolute maximum from their MSX125cc and high-output Pit Bike or Go-Kart engines. Featuring a unique "Dual Stack" intake and the legendary MJN (Multiple Jet Needle) technology, this carburetor provides a level of fuel atomization that standard carburetors simply cannot match.

The "Dual Stack" refers to the specialized intake velocity stack, which optimizes air intake speed and reduces turbulence. This results in an explosive throttle response and a significant increase in mid-to-high range horsepower, making it the preferred choice for competitive racing and custom performance builds.

Product Compatibility

• Primary Fitment: Honda MSX125 (Grom) and similar high-performance 125cc platforms.
• Vehicle Types: Racing Pit Bikes, Dirt Bikes, ATVs, and Competition Go-Karts.
• Tuning Grade: Professional / Competition Racing.

Available Sizes:

• YD-MJN28: 28mm (1.1") Inner Diameter — Ideal for high-response 125cc builds.
• YD-MJN30: 30mm (1.18") Inner Diameter — Optimized for big-bore kits and maximum top-end speed.

Why Choose the YD-MJN Dual Stack Series?

• Advanced MJN Technology: The Multiple Jet Needle system provides a more precise and finer fuel mist than a standard needle. This leads to cleaner combustion, better fuel efficiency, and a smoother power curve.
• Dual Stack Velocity: The integrated velocity stack increases air velocity into the venturi, ensuring that the engine receives the maximum volume of air with every stroke.
• Precision Racing Build: Made from high-strength, sturdy materials, this carburetor is designed to maintain its tune under the extreme vibrations and heat of the race track.
• Distinctive Racing Aesthetic: Beyond performance, the YD-MJN dual-stack design adds a professional, high-performance "works" look to your engine bay.