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Start ShoppingMIKUNI F4/042-230 Hex Main Jets - High-Performance Fuel Delivery for Racing & Off-Road Vehicles
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Description
Upgrade your engine's fuel delivery system with MIKUNI's F4/042-230 Hex Main Jets. These high-performance jets deliver precise fuel metering for maximum power and efficiency in racing and off-road environments.
Key Features
- Hexagonal Design: Ensures secure fitment and easy adjustment for accurate fuel flow control.
- Durable Construction: Made from high-quality brass for long-lasting performance in demanding conditions.
- Compatibility: Specifically designed for MIKUNI carburetor models requiring F4/042-230 main jet sizing.
- Smooth Fuel Flow: Optimized bore and seat design reduces turbulence for consistent fuel delivery.
Why Choose This Product
Whether you're tuning a racing engine or enhancing off-road performance, these jets provide reliable fuel metering that improves throttle response and maintains consistent power output. The hex design simplifies installation and adjustment, while the durable brass construction resists corrosion and wear. Ideal for riders seeking precise control over their engine's fuel delivery system.
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Upgrade your engine's fuel delivery system with MIKUNI's F4/042-230 Hex Main Jets. These high-performance jets deliver precise fuel metering for maximum power and efficiency in racing and off-road environments.
Key Features
- Hexagonal Design: Ensures secure fitment and easy adjustment for accurate fuel flow control.
- Durable Construction: Made from high-quality brass for long-lasting performance in demanding conditions.
- Compatibility: Specifically designed for MIKUNI carburetor models requiring F4/042-230 main jet sizing.
- Smooth Fuel Flow: Optimized bore and seat design reduces turbulence for consistent fuel delivery.
Why Choose This Product
Whether you're tuning a racing engine or enhancing off-road performance, these jets provide reliable fuel metering that improves throttle response and maintains consistent power output. The hex design simplifies installation and adjustment, while the durable brass construction resists corrosion and wear. Ideal for riders seeking precise control over their engine's fuel delivery system.
| SKU | GM2ED0AC2C |
|---|---|
| MPN | F4/042-230 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various | Mikuni TM/VM/PF series carburetors | 1980-2025 |
Frequently Asked Questions
Fits Mikuni TM40/42 flat-slide carbs and VM/PF round-slide carbs on many 2-stroke/4-stroke dirt bikes and ATVs.
Use a jet kit chart based on altitude, temperature, mods (exhaust, air filter), and plug reading. Larger than stock for richer mixtures.
Yes, OEM-quality Mikuni part number F4/042-230.
No, threading and taper are Mikuni-specific.
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/fuel screws before disassembly. Clean jet with carb cleaner. Test in small increments.
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet size selection for engine mods
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for stock Mikuni jets
Improvements
- Precision machining for consistent fuel flow
- Hex head for easy install/removal
Considerations
- None - identical to factory spec
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning (carb service every 20-50 hours)
Warranty
Limited manufacturer warranty (defects only)
Maintenance
Remove and clean during every carb cleaning; inspect for wear/clogging
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