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YD-MJN30 Racing Carburetor 30mm for MSX125 Big Bore Pit Bike & ATV
YD-MJN30 Racing Carburetor 30mm for MSX125 Big Bore Pit Bike & ATV
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Product Overview
Build for stronger top-end performance with this YD-MJN30 Racing Carburetor, designed for Honda MSX125 / Grom-style performance builds, pit bikes, dirt bikes, ATVs, and go-karts using modified or big bore engine setups.
With a larger 30mm inner diameter, this carburetor is better suited for engines that need increased airflow at higher RPM. It is a strong option for racing builds where top-end power, high-speed performance, and aggressive acceleration are more important than low-speed stock-style drivability.
The MJN-style fuel needle system helps improve fuel atomization, while the dual stack velocity intake supports smoother airflow into the engine. Because this is a performance carburetor, proper tuning, jetting, and setup are required for best results.
Product Compatibility
| Category | Fitment |
|---|---|
| Primary Model | Honda MSX125 / Grom-style engines |
| Engine Type | Modified 125cc / big bore performance engines |
| Vehicle Type | Pit Bike, Dirt Bike, ATV, Go-Kart |
| Build Type | Racing, Big Bore, High-Output Performance Upgrade |
| Carburetor Size | 30mm inner diameter |
Specifications
| Specification | Details |
|---|---|
| Model | YD-MJN30 |
| Carburetor Type | Racing Performance Carburetor |
| Inner Diameter | 30mm / 1.18" |
| Technology | MJN-style Multiple Jet Needle |
| Intake Design | Dual Stack Velocity Intake |
| Material | High-strength alloy |
| Recommended Use | Top-end power / big bore racing builds |
| Condition | 100% New |
Key Features
- 30mm High-Flow Design – Provides increased airflow for high-RPM and big bore engine performance.
- Built for Top-End Power – A strong choice for racing builds that need more upper-range output.
- MJN-Style Fuel Technology – Helps create finer fuel atomization for smoother and more efficient combustion.
- Dual Stack Velocity Intake – Improves intake airflow stability and supports stronger acceleration.
- Performance Upgrade for Tuned Engines – Suitable for modified MSX125-style engines, pit bikes, ATVs, and go-karts.
Need Faster Throttle Response?
If you want sharper throttle response and stronger mid-range acceleration for a 125cc performance build, the YD-MJN28 28mm Racing Carburetor may be a better choice. The 28mm version is easier to match with smaller modified engines.
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Fitment FAQ
Will this part fit my specific model and year?
The YD-MJN30 carburetor is best suited for big bore or heavily modified MSX125 / Grom-style engines, pit bikes, ATVs, dirt bikes, and go-karts that need stronger high-RPM airflow and improved top-end power.
Do I need to match the OEM part number?
No. The YD-MJN30 is an aftermarket racing performance carburetor for modified engines, not a factory OEM direct replacement. Please verify the intake diameter, mounting setup, throttle cable connection, and air filter fitment before purchase.
What models or situations does this part not fit?
This carburetor is not recommended for stock or lightly modified 125cc engines. If the engine cannot use the larger 30mm airflow capacity, it may reduce low-end response and make tuning more difficult.
What should I check before ordering?
Before ordering, please confirm your engine displacement, big bore setup, intake manifold size, throttle cable style, air filter fitment, and installation clearance. The 30mm size is designed for higher airflow demand and usually requires proper tuning.