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Start ShoppingMIKUNI F4/042-105 Hex Main Jets - Precision Brass Fuel Metering Jets for Carburetors
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Description
Upgrade your carburetor's fuel delivery system with MIKUNI's precision-engineered F4/042-105 Hex Main Jets. These brass jets ensure accurate fuel metering for responsive engine performance and consistent power delivery across a range of powersports applications.
Key Features
- Brass Construction: Corrosion-resistant material ensures long-lasting durability in harsh engine environments.
- 0.105" Orifice Size: Precisely sized for optimal fuel flow rates, balancing power and efficiency in carbureted engines.
- Hex Head Design: Standardized hex shape simplifies installation and compatibility with most carburetor systems.
- Negligible Weight: Lightweight design minimizes impact on engine performance while maintaining structural integrity.
Why Choose This Product
MIKUNI's F4/042-105 jets deliver unmatched accuracy for fuel metering, ensuring your engine runs smoothly under varying conditions. The brass material resists clogging and corrosion, while the precise 0.105" orifice size provides balanced fuel flow for improved throttle response and fuel efficiency. Whether you're tuning a motorcycle, ATV, or off-road vehicle, these jets offer reliable performance without compromising engine longevity.
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Upgrade your carburetor's fuel delivery system with MIKUNI's precision-engineered F4/042-105 Hex Main Jets. These brass jets ensure accurate fuel metering for responsive engine performance and consistent power delivery across a range of powersports applications.
Key Features
- Brass Construction: Corrosion-resistant material ensures long-lasting durability in harsh engine environments.
- 0.105" Orifice Size: Precisely sized for optimal fuel flow rates, balancing power and efficiency in carbureted engines.
- Hex Head Design: Standardized hex shape simplifies installation and compatibility with most carburetor systems.
- Negligible Weight: Lightweight design minimizes impact on engine performance while maintaining structural integrity.
Why Choose This Product
MIKUNI's F4/042-105 jets deliver unmatched accuracy for fuel metering, ensuring your engine runs smoothly under varying conditions. The brass material resists clogging and corrosion, while the precise 0.105" orifice size provides balanced fuel flow for improved throttle response and fuel efficiency. Whether you're tuning a motorcycle, ATV, or off-road vehicle, these jets offer reliable performance without compromising engine longevity.
| SKU | GM9BD4C56A |
|---|---|
| MPN | F4/042-105 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Models with Mikuni VM/PF/BS carburetors (e.g., Honda XR/CRF, Yamaha YZ/WR, Kawasaki KX/KLX, Suzuki RM/DRZ) | 1980-2025 |
Frequently Asked Questions
Fits Mikuni VM series, PF series, BS series, and many round/flat slide carbs on 2-stroke and 4-stroke powersports vehicles.
Use plug reading, EGT gauge, or wideband O2 sensor. Start with OEM size and adjust based on mods/elevation.
Mikuni OEM-style hex main jet; precision machined brass for accurate fuel flow.
Yes, if equipped with compatible Mikuni carb (e.g., Honda TRX, Yamaha Grizzly). Check fitment tab.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench or hex key (optional)
Pro Tips
- Remove float bowl completely for access. Always test plug chop after install to verify jetting
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet sizing without prior tuning
Comparison vs Stock/OEM
Direct OEM replacement or upgrade; same brass construction but available in precise sizes for tuning
Improvements
- Enables custom fuel metering for performance mods
- Better than worn factory jets
Considerations
- Requires carb tuning knowledge; not plug-and-play without testing
Durability & Warranty
Expected Lifespan
Indefinite (until physically damaged); outlasts carb life
Warranty
Limited lifetime from Mikuni against defects
Maintenance
Inspect for debris/clogs during carb cleaning; replace if deformed
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