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Start ShoppingMIKUNI F4/042-360 Hex Main Jet - Precision Brass Fuel Jet for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with the MIKUNI F4/042-360 Hex Main Jet. This precision-engineered component delivers optimal air-fuel ratios for enhanced power, efficiency, and responsiveness across a range of off-road and on-road applications.
Key Features
- Hexagonal Head Design: Enables precise fuel adjustment with minimal risk of cross-threading during installation.
- Brass Construction: Resists corrosion and maintains dimensional stability under high-temperature engine conditions.
- Minimal Weight: Lightweight design reduces rotational mass for improved engine responsiveness and throttle reaction.
- Standard Dimensions: Compatible with most MIKUNI carburetor setups for easy installation and tuning flexibility.
Why Choose This Product
Whether you're tuning a racing motorcycle, modifying an ATV, or optimizing a UTV, the MIKUNI F4/042-360 Main Jet offers unmatched precision and durability. Its hexagonal head design simplifies adjustment while maintaining sealing integrity, and the brass material ensures long-term performance without warping or degradation. The lightweight construction enhances engine efficiency, while standard dimensions make it a versatile choice for a wide range of powersports applications.
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Upgrade your powersports engine's fuel delivery system with the MIKUNI F4/042-360 Hex Main Jet. This precision-engineered component delivers optimal air-fuel ratios for enhanced power, efficiency, and responsiveness across a range of off-road and on-road applications.
Key Features
- Hexagonal Head Design: Enables precise fuel adjustment with minimal risk of cross-threading during installation.
- Brass Construction: Resists corrosion and maintains dimensional stability under high-temperature engine conditions.
- Minimal Weight: Lightweight design reduces rotational mass for improved engine responsiveness and throttle reaction.
- Standard Dimensions: Compatible with most MIKUNI carburetor setups for easy installation and tuning flexibility.
Why Choose This Product
Whether you're tuning a racing motorcycle, modifying an ATV, or optimizing a UTV, the MIKUNI F4/042-360 Main Jet offers unmatched precision and durability. Its hexagonal head design simplifies adjustment while maintaining sealing integrity, and the brass material ensures long-term performance without warping or degradation. The lightweight construction enhances engine efficiency, while standard dimensions make it a versatile choice for a wide range of powersports applications.
| SKU | GM14878642 |
|---|---|
| MPN | F4/042-360 |
| Brand | MIKUNI |
| Category | Jets |
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Frequently Asked Questions
F4 indicates the MIKUNI carburetor series, 042 is the jet size (typically 1.42mm), and 360 refers to the hex head design. The specific number indicates the fuel flow rating.
Jet selection depends on your engine, altitude, temperature, and fuel type. Consult your carburetor manual, engine builder, or tuning guide. Start with the recommended baseline and adjust based on plug color and performance.
No. Verify your carburetor model number and consult compatibility charts. Different MIKUNI carburetors use different jet sizes and designs.
Main jets don't wear out but may need changing if you modify your engine, change altitude significantly, or adjust fuel mixture. They typically last the life of the carburetor.
Hex jets have a hexagonal head for easier removal/installation with a wrench. Round jets require a jet removal tool. Functionally, they perform the same.
Installation Guide
Difficulty
Medium
Est. Time
15 min
Tools Required
- Carburetor removal tools
- Small hex wrench or jet removal tool
- Carburetor cleaning supplies
- Gasket scraper
Pro Tips
- Document your original jetting before making changes
- Clean the carburetor thoroughly before installing new jets
- Use a jet kit guide specific to your carburetor model
- Test ride after jetting changes to verify performance
- Keep spare jets on hand for field adjustments
Common Mistakes to Avoid
- Not cleaning carburetor before jetting changes
- Over-tightening jets (can strip brass)
- Mixing up jet sizes during installation
- Not documenting original jet size before removal
Durability & Warranty
Expected Lifespan
Indefinite - brass jets do not wear out under normal use
Warranty
Typically covered under MIKUNI manufacturer warranty (varies by retailer)
Maintenance
No maintenance required; inspect for debris or damage during carburetor service
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