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Start ShoppingMIKUNI F4/042-130 Hex Main Jets - Brass Fuel Jet for Precise Fuel Metering
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Description
Upgrade your carburetor's fuel delivery system with MIKUNI's precision-engineered F4/042-130 Hex Main Jets. These brass fuel jets ensure accurate fuel metering for optimal engine performance, responsiveness, and fuel efficiency in two-stroke and four-stroke engines.
Key Features
- Size #130: Perfectly calibrated for high-performance fuel delivery in demanding riding conditions.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting reliability in harsh environments.
- Hex Head Thread: Simplifies installation and adjustment while maintaining secure fuel flow control.
- Precise Flow Rate: Fine-tuned metering for consistent power output and fuel efficiency.
Why Choose This Product
Engineers and riders rely on MIKUNI jets for their unmatched accuracy and compatibility with factory carburetor systems. This main jet delivers consistent fuel flow across RPM ranges, reducing fouling and improving throttle response. The brass material resists clogging and maintains performance in extreme temperatures, making it ideal for racing, off-road, and high-output applications.
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Upgrade your carburetor's fuel delivery system with MIKUNI's precision-engineered F4/042-130 Hex Main Jets. These brass fuel jets ensure accurate fuel metering for optimal engine performance, responsiveness, and fuel efficiency in two-stroke and four-stroke engines.
Key Features
- Size #130: Perfectly calibrated for high-performance fuel delivery in demanding riding conditions.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting reliability in harsh environments.
- Hex Head Thread: Simplifies installation and adjustment while maintaining secure fuel flow control.
- Precise Flow Rate: Fine-tuned metering for consistent power output and fuel efficiency.
Why Choose This Product
Engineers and riders rely on MIKUNI jets for their unmatched accuracy and compatibility with factory carburetor systems. This main jet delivers consistent fuel flow across RPM ranges, reducing fouling and improving throttle response. The brass material resists clogging and maintains performance in extreme temperatures, making it ideal for racing, off-road, and high-output applications.
| SKU | GM451BB60E |
|---|---|
| MPN | F4/042-130 |
| 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, Suzuki RM) | 1980-2025 |
| Kawasaki | KX/KLX series | 1990-2010 |
Frequently Asked Questions
Fits Mikuni VM26-VM34, PF, BS30/BS36, HSR42/45 series carburetors commonly found on Honda, Yamaha, Suzuki, Kawasaki 2-stroke/4-stroke bikes.
Use a jet kit recommendation chart based on altitude, temperature, mods (exhaust/air filter), or consult a dyno tuner.
Hex jets have a hex head for easier installation/removal with a wrench; function is identical to round jets.
Correct sizing optimizes air/fuel ratio for better power and throttle response, especially after mods.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench or hex key
Pro Tips
- Remove float bowl completely for access; note original jet size before swapping
Common Mistakes to Avoid
- Installing wrong size jet
- Not cleaning carb passages before install
Comparison vs Stock/OEM
Direct replacement for OEM main jets; precision machined brass same as factory
Improvements
- Easier hex head for tool-free swaps
- Consistent flow calibration
Considerations
- None; identical function to OEM
Durability & Warranty
Expected Lifespan
Indefinite with proper carb maintenance
Warranty
Limited manufacturer defect warranty
Maintenance
Inspect for corrosion/clogging during carb cleans; clean with carb cleaner
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