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Start ShoppingMIKUNI F4/042-220 Hex Main Jets - Precision Fuel Control for High-Performance Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with MIKUNI's F4/042-220 Hex Main Jets. These precision-engineered jets ensure optimal fuel-air mixture for enhanced power, responsiveness, and fuel efficiency across a range of off-road and on-road vehicles.
Key Features
- Hexagonal Jet Design: Ensures secure, leak-free installation and precise fuel flow control for consistent engine performance.
- High-Flow Capacity: Optimized for high-performance engines, delivering improved throttle response and power output.
- Durable Brass Construction: Resists corrosion and wear, ensuring long-lasting reliability in demanding environments.
- Easy Installation: Compatible with standard MIKUNI carburetor setups for quick, hassle-free replacement.
- Adjustable Fuel Mixture: Fine-tune air-fuel ratios to match riding conditions and engine modifications.
Why Choose This Product
MIKUNI Hex Main Jets are trusted by riders worldwide for their precision engineering and performance-enhancing capabilities. Whether you're tackling rugged trails or racing on the track, these jets deliver consistent fuel delivery, reduce engine knocking, and maximize horsepower. Their durable construction ensures they withstand extreme temperatures and vibrations, while the adjustable design allows for customization to suit your riding style and engine tuning needs.
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Upgrade your powersports engine's fuel delivery system with MIKUNI's F4/042-220 Hex Main Jets. These precision-engineered jets ensure optimal fuel-air mixture for enhanced power, responsiveness, and fuel efficiency across a range of off-road and on-road vehicles.
Key Features
- Hexagonal Jet Design: Ensures secure, leak-free installation and precise fuel flow control for consistent engine performance.
- High-Flow Capacity: Optimized for high-performance engines, delivering improved throttle response and power output.
- Durable Brass Construction: Resists corrosion and wear, ensuring long-lasting reliability in demanding environments.
- Easy Installation: Compatible with standard MIKUNI carburetor setups for quick, hassle-free replacement.
- Adjustable Fuel Mixture: Fine-tune air-fuel ratios to match riding conditions and engine modifications.
Why Choose This Product
MIKUNI Hex Main Jets are trusted by riders worldwide for their precision engineering and performance-enhancing capabilities. Whether you're tackling rugged trails or racing on the track, these jets deliver consistent fuel delivery, reduce engine knocking, and maximize horsepower. Their durable construction ensures they withstand extreme temperatures and vibrations, while the adjustable design allows for customization to suit your riding style and engine tuning needs.
| SKU | GM2829907D |
|---|---|
| MPN | F4/042-220 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (e.g., Honda XR series, Yamaha YZ, Kawasaki KX) | 1980-2025 |
| Suzuki | RM/DR-Z series | 1990-2010 |
Frequently Asked Questions
Fits Mikuni round-slide carbs like VM26-428, VM34, BS36, PF series. Check your carb markings.
Use plug chop method or wideband O2 sensor. #220 is for richer mixtures at high RPM/altitude.
Yes, OEM-quality from Mikuni. Avoid cheap knockoffs that clog easily.
Yes, common on trail and MX bikes like Honda CRF, Yamaha WR.
Yes, Mikuni F4/042 series from #50 to #230.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- 6mm or 8mm socket wrench
Pro Tips
- Count turns on air screw before removal
- Clean jet orifice with carb cleaner
- Test multiple sizes for optimal jetting
Common Mistakes to Avoid
- Not cleaning carb bowl before install
- Installing wrong jet size
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for worn jets
Improvements
- Precise fuel delivery for better performance
- Corrosion-resistant brass
- Easier hex install vs slotted
Considerations
- Must match engine mods/altitude; stock may suffice for unmodified bikes
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning; replace if corroded or damaged
Warranty
Limited manufacturer warranty (defects only)
Maintenance
Clean with carb cleaner during rebuilds; inspect for debris annually
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