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Start ShoppingMIKUNI F4/042-460 Hex Main Jets - High-Performance Brass Fuel Jet for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with MIKUNI's F4/042-460 Hex Main Jets. These precision-engineered brass jets deliver consistent fuel flow for enhanced power, responsiveness, and long-term reliability in high-performance applications.
Key Features
- Brass Construction: Corrosion-resistant material ensures durability in harsh engine environments.
- Hex Head Thread: 5/16-32 thread pattern simplifies installation and adjustment for precise fuel metering.
- #460 Jet Size: Optimized flow rate for balanced power delivery and fuel efficiency.
- Compact Design: 0.5" length and 0.375" hex width fit standard carburetor configurations.
Why Choose This Product
Mikuni jets are trusted by racers and enthusiasts for their precision machining and consistent performance. The lightweight brass construction reduces engine strain while maintaining structural integrity. This jet's hex head design allows for easy access during maintenance, ensuring hassle-free tuning and adjustments. Whether you're modifying a dirt bike, ATV, or off-road vehicle, these jets deliver reliable fuel flow for peak engine performance.
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Upgrade your powersports engine's fuel delivery system with MIKUNI's F4/042-460 Hex Main Jets. These precision-engineered brass jets deliver consistent fuel flow for enhanced power, responsiveness, and long-term reliability in high-performance applications.
Key Features
- Brass Construction: Corrosion-resistant material ensures durability in harsh engine environments.
- Hex Head Thread: 5/16-32 thread pattern simplifies installation and adjustment for precise fuel metering.
- #460 Jet Size: Optimized flow rate for balanced power delivery and fuel efficiency.
- Compact Design: 0.5" length and 0.375" hex width fit standard carburetor configurations.
Why Choose This Product
Mikuni jets are trusted by racers and enthusiasts for their precision machining and consistent performance. The lightweight brass construction reduces engine strain while maintaining structural integrity. This jet's hex head design allows for easy access during maintenance, ensuring hassle-free tuning and adjustments. Whether you're modifying a dirt bike, ATV, or off-road vehicle, these jets deliver reliable fuel flow for peak engine performance.
| SKU | GM3002F85A |
|---|---|
| MPN | F4/042-460 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Suzuki, Yamaha, Kawasaki, Honda) | Multiple carbureted models (e.g., Suzuki DR-Z400, Yamaha YZ250, Kawasaki KX250) | 1985-2025 |
Frequently Asked Questions
Fits most Mikuni round-slide carbs (VM26-VM34, BS32-36, TM series). Confirm your carb model and stock jet size.
Use a plug chop test or wideband O2 sensor to determine main jet size based on jetting chart for your setup/elevation/modifications.
Hex jets are for easier installation/removal; functionally identical to round jets of same size.
No, Mikuni jets have different threading; use OEM or compatible Keihin jets for those carbs.
Yes, many retailers offer packs of 5 or 10 for tuning multiple sizes.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench or needle nose pliers
Pro Tips
- Count turns on air screw before disassembly
- Use carb cleaner to inspect passages
- Install with emulsion tube aligned
Common Mistakes to Avoid
- Dropping the jet into carb body
- Not cleaning needle jet before install
Comparison vs Stock/OEM
Direct replacement for OEM Mikuni jets; identical function but hex head allows easier tool-free removal
Improvements
- Easier installation without special tools
- Reusable multiple times for tuning
Considerations
- None; precision machined to OEM specs
Durability & Warranty
Expected Lifespan
Indefinite with proper care (reusable for years of tuning)
Warranty
Limited manufacturer warranty against defects
Maintenance
Inspect for damage/crushed brass; clean with carb cleaner only (no abrasives)
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