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Start ShoppingMIKUNI F4/042-280 Hex Main Jets - Precision Brass Main Jet for Carburetors
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Description
Upgrade your carburetor's fuel delivery system with MIKUNI's F4/042-280 Hex Main Jets. This precision-engineered brass jet ensures optimal fuel-air mixture for enhanced power, responsiveness, and engine longevity. Perfect for riders seeking fine-tuned performance tuning in motorcycles, ATVs, and off-road vehicles.
Key Features
- Material: Durable Brass Construction - Resists corrosion and maintains precise flow rates under extreme conditions
- Orifice Size: 0.280-Inch Diameter - Calibrated for precise fuel flow control in carburetor systems
- Weight: Lightweight 0.5g Design - Enhances throttle response and fuel efficiency
- Compatibility: Universal Fit for MIKUNI Carburetors - Ensures seamless integration with existing systems
Why Choose This Product
MIKUNI's F4/042-280 main jets deliver unmatched reliability and performance for riders who demand precision. The brass material ensures long-term durability, while the 0.280-inch orifice provides consistent fuel flow for smooth power delivery. Its lightweight design reduces engine strain, and the calibrated flow rate ensures optimal combustion efficiency. Whether you're modifying a classic bike or tuning a modern off-road machine, these jets offer the accuracy needed for professional-level performance.
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Upgrade your carburetor's fuel delivery system with MIKUNI's F4/042-280 Hex Main Jets. This precision-engineered brass jet ensures optimal fuel-air mixture for enhanced power, responsiveness, and engine longevity. Perfect for riders seeking fine-tuned performance tuning in motorcycles, ATVs, and off-road vehicles.
Key Features
- Material: Durable Brass Construction - Resists corrosion and maintains precise flow rates under extreme conditions
- Orifice Size: 0.280-Inch Diameter - Calibrated for precise fuel flow control in carburetor systems
- Weight: Lightweight 0.5g Design - Enhances throttle response and fuel efficiency
- Compatibility: Universal Fit for MIKUNI Carburetors - Ensures seamless integration with existing systems
Why Choose This Product
MIKUNI's F4/042-280 main jets deliver unmatched reliability and performance for riders who demand precision. The brass material ensures long-term durability, while the 0.280-inch orifice provides consistent fuel flow for smooth power delivery. Its lightweight design reduces engine strain, and the calibrated flow rate ensures optimal combustion efficiency. Whether you're modifying a classic bike or tuning a modern off-road machine, these jets offer the accuracy needed for professional-level performance.| SKU | GM88B3521D |
|---|---|
| MPN | F4/042-280 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Yamaha, Honda, Suzuki, Kawasaki) | Multiple carbureted models | 1985-2024 |
Frequently Asked Questions
Fits most Mikuni round or hex main jets in VM, BS, HSR, TM series carbs used on dirt bikes, ATVs, and street bikes.
Check your current jet or use a jetting chart based on elevation, mods, and clip position. #280 is for richer mid-high RPM mixtures.
Yes, Mikuni is the OEM supplier for many Japanese bikes; this is genuine Mikuni.
No, this is for carbureted engines only.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Jet cleaning needle or wire
Pro Tips
- Remove carb, unscrew old jet with screwdriver, note position, install new one finger tight then snug. Always rejet in pairs for balance.
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet size selection
Comparison vs Stock/OEM
Genuine Mikuni, identical to OEM on many bikes
Improvements
- Precision machined for consistent fuel flow
- Durable brass resists corrosion
Considerations
- None - direct OEM equivalent
Durability & Warranty
Expected Lifespan
Lasts entire carb life with proper cleaning
Warranty
Limited manufacturer warranty through retailer
Maintenance
Clean with carb cleaner every 20-50 hours; inspect during rejetting
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