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YD-MJN28 Racing Carburetor 28mm for Honda MSX125, Pit Bike & ATV
YD-MJN28 Racing Carburetor 28mm for Honda MSX125, Pit Bike & ATV
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Product Overview
Upgrade your small-engine performance build with this YD-MJN28 Racing Carburetor, designed for Honda MSX125 / Grom-style engines, pit bikes, dirt bikes, ATVs, and go-karts using modified 125cc performance platforms.
With a 28mm inner diameter, this version is a strong choice for riders who want quicker throttle response, smoother fuel delivery, and improved mid-range acceleration without going too large on carburetor size. The MJN-style fuel needle design helps improve atomization, while the dual stack velocity intake supports faster airflow and cleaner throttle pickup.
This carburetor is best suited for performance builds, racing setups, and tuned engines. Proper jetting, intake matching, and tuning may be required for best results.
Product Compatibility
| Category | Fitment |
|---|---|
| Primary Model | Honda MSX125 / Grom-style engines |
| Engine Type | Modified 125cc high-performance engines |
| Vehicle Type | Pit Bike, Dirt Bike, ATV, Go-Kart |
| Build Type | Racing, Big Bore, Performance Upgrade |
| Carburetor Size | 28mm inner diameter |
Specifications
| Specification | Details |
|---|---|
| Model | YD-MJN28 |
| Carburetor Type | Racing Performance Carburetor |
| Inner Diameter | 28mm / 1.10" |
| Technology | MJN-style Multiple Jet Needle |
| Intake Design | Dual Stack Velocity Intake |
| Material | High-strength alloy |
| Recommended Use | Throttle response / street racing / modified 125cc builds |
| Condition | 100% New |
Key Features
- 28mm Performance Size – Ideal for quicker throttle response and stronger mid-range acceleration.
- MJN-Style Fuel Technology – Helps improve fuel atomization for smoother combustion.
- Dual Stack Intake Design – Supports improved airflow velocity and reduced intake turbulence.
- Race-Ready Alloy Body – Built for high-RPM, high-heat, and vibration-heavy riding conditions.
- Great for Modified 125cc Builds – Suitable for MSX125-style engines, pit bikes, ATVs, and go-karts with proper tuning.
Need More Top-End Power?
If your build uses a larger displacement or big bore engine setup, you may prefer the YD-MJN30 30mm Racing Carburetor. The 30mm version is designed for higher airflow demand and stronger top-end performance.
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Fitment FAQ
Will this part fit my specific model and year?
The YD-MJN28 carburetor is best suited for Honda MSX125 / Grom-style engines and modified 125cc pit bike, ATV, dirt bike, or go-kart builds that need quicker throttle response and stronger mid-range acceleration.
Do I need to match the OEM part number?
No. The YD-MJN28 is an aftermarket racing performance carburetor, not an OEM replacement. Please compare the intake size, throttle cable connection, air filter side, and overall design with your original carburetor before ordering.
What models or situations does this part not fit?
This carburetor is not recommended for fully stock low-performance engines without tuning. If the engine, intake, or exhaust setup cannot support the added airflow, it may cause poor idle, bogging, hard starting, or unstable throttle response.
What should I check before ordering?
Before ordering, please confirm your engine setup, intake manifold size, throttle cable style, air filter fitment, and available installation space. The YD-MJN28 is a performance carburetor, so tuning or jetting adjustment may be required after installation.