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Start ShoppingMIKUNI F4/042-95 Hex Main Jets - Precision Fuel Metering for High-Performance Engines
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Description
Upgrade your engine's fuel delivery system with MIKUNI's F4/042-95 Hex Main Jets. These precision-engineered brass jets deliver consistent fuel metering for enhanced power, responsiveness, and reliability in high-performance engines.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding conditions.
- 0.130 Inch Orifice: Equivalent to #130 main jet size for precise fuel flow calibration.
- Hex Head Design: Simplifies installation and adjustment for accurate tuning.
- Lightweight Build: Only 0.5 grams per jet reduces overall system weight without compromising durability.
Why Choose This Product
Engineers and racers rely on MIKUNI jets for their unmatched accuracy and compatibility with carburetor systems. The calibrated flow rate ensures optimal air-fuel ratios, while the hex head design allows for easy maintenance. Whether you're tuning a sport bike, off-road vehicle, or modified engine, these jets provide the precision needed to unlock maximum performance without sacrificing reliability.
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Upgrade your engine's fuel delivery system with MIKUNI's F4/042-95 Hex Main Jets. These precision-engineered brass jets deliver consistent fuel metering for enhanced power, responsiveness, and reliability in high-performance engines.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding conditions.
- 0.130 Inch Orifice: Equivalent to #130 main jet size for precise fuel flow calibration.
- Hex Head Design: Simplifies installation and adjustment for accurate tuning.
- Lightweight Build: Only 0.5 grams per jet reduces overall system weight without compromising durability.
Why Choose This Product
Engineers and racers rely on MIKUNI jets for their unmatched accuracy and compatibility with carburetor systems. The calibrated flow rate ensures optimal air-fuel ratios, while the hex head design allows for easy maintenance. Whether you're tuning a sport bike, off-road vehicle, or modified engine, these jets provide the precision needed to unlock maximum performance without sacrificing reliability.
| SKU | GM398D4BD6 |
|---|---|
| MPN | F4/042-95 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Suzuki | RM250, RMZ250, RM80, RM85, RM125 | 1985-2005 |
| Kawasaki | KX125, KX250, KX500 | 1980-2010 |
| Yamaha | YZ125, YZ250, WR250 | 1990-2020 |
| Honda | CR125, CR250, CRF250R | 1980-2015 |
Frequently Asked Questions
Fits Mikuni TM series and Keihin PWK/VM carbs on 2-stroke and 4-stroke dirt bikes from 1980s-2010s.
Yes, OEM Mikuni hex main jet, size #130 (marked 042-95).
Single jet for fine-tuning; consider full kit for complete rejetting.
No, carbureted models only.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Needle nose pliers
- Carb cleaner
Pro Tips
- Verify jet size by holding to light - clip should be centered
- Always rejet in pairs (pilot and main) for balanced fueling
Common Mistakes to Avoid
- Not cleaning carb bowl before install
- Installing wrong size jet
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for worn factory jets
Improvements
- Precise fuel metering for optimal performance
- Corrosion-resistant brass
- Easier hex install vs slotted
Considerations
- Must match exact size to stock for plug-and-play
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning; replace if clogged or eroded
Warranty
Mikuni lifetime against defects
Maintenance
Clean with carb cleaner every 10-20 hours; inspect during service
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