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Start ShoppingMIKUNI Large Round Main Jet 127.5 - High-Performance Brass Jet for Precision Fuel Delivery
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Description
Upgrade your two-stroke engine's performance with MIKUNI's Large Round Main Jet (127.5). This precision-crafted brass jet ensures accurate fuel-air mixture delivery, enhancing throttle response and engine efficiency for riders demanding peak power and reliability.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh engine environments.
- M5 x 0.75 Thread: Universal compatibility with MIKUNI carburetor systems for easy installation.
- 0.5g Lightweight Design: Reduces rotational mass while maintaining precise fuel flow control.
- 5.8mm Outer Diameter: Optimized flow dynamics for smooth power delivery across RPM ranges.
Why Choose This Product
Engineers and tuners rely on MIKUNI jets for their unmatched accuracy and consistency. This large round main jet delivers reliable fuel metering, ensuring your engine runs cooler, revs smoother, and produces maximum power without fouling. The brass alloy resists wear from fuel and heat, while the precise 127.5 size ensures perfect fitment for carburetor tuning applications. Whether you're racing or riding recreationally, this jet provides the foundation for a responsive, efficient powerplant.
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Upgrade your two-stroke engine's performance with MIKUNI's Large Round Main Jet (127.5). This precision-crafted brass jet ensures accurate fuel-air mixture delivery, enhancing throttle response and engine efficiency for riders demanding peak power and reliability.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh engine environments.
- M5 x 0.75 Thread: Universal compatibility with MIKUNI carburetor systems for easy installation.
- 0.5g Lightweight Design: Reduces rotational mass while maintaining precise fuel flow control.
- 5.8mm Outer Diameter: Optimized flow dynamics for smooth power delivery across RPM ranges.
Why Choose This Product
Engineers and tuners rely on MIKUNI jets for their unmatched accuracy and consistency. This large round main jet delivers reliable fuel metering, ensuring your engine runs cooler, revs smoother, and produces maximum power without fouling. The brass alloy resists wear from fuel and heat, while the precise 127.5 size ensures perfect fitment for carburetor tuning applications. Whether you're racing or riding recreationally, this jet provides the foundation for a responsive, efficient powerplant.| SKU | GM4DBE82BF |
|---|---|
| MPN | FN100604-127.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Universal) | Mikuni VM/PF/BS/VM26/VM30/VM34/VM36/VM38/VM40 carburetors | 1980-2025 |
| Honda | CRF250R, CRF450R, XR400R, XR650R | 1990-2024 |
| Yamaha | YZ125, YZ250, WR250, TTR125 | 1985-2024 |
| Kawasaki | KX250, KX450, KLX300 | 1990-2024 |
Frequently Asked Questions
Yes, FN100604 series fits VM26-VM42 round slide carburetors including VM34.
Use Mikuni jetting chart based on altitude, temperature, mods, and plug reading. Start with current jet +3-5 sizes richer.
This is genuine Mikuni OEM quality jet, part number FN100604-127.5.
Individual jets for precise sizing. Kits good for initial rejetting range.
Depends on your setup. Typically stock needle in middle, 42-48 pilot jet.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench (optional)
- Flashlight
Pro Tips
- Clean carb thoroughly before rejetting
- Use jet chart for proper sizing
- Mark current jet size before removal
- Install with carb upside down to avoid losing small parts
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Damaging o-ring on needle jet
- Incorrect jet sizing for conditions
Comparison vs Stock/OEM
Genuine Mikuni replacement for OEM jets
Improvements
- Precision machined for consistent flow
- Pure brass construction
- Exact OEM specifications
Considerations
- Must match your specific carb model
Durability & Warranty
Expected Lifespan
Indefinite with proper fuel filter
Warranty
Limited manufacturer warranty
Maintenance
Inspect during carb cleaning, replace if clogged or damaged
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