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Start ShoppingMIKUNI F4/042-430 Hex Main Jets - High-Performance Brass Carburetor Jets for Racing & Off-Road
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Description
Upgrade your engine's performance with MIKUNI's F4/042-430 Hex Main Jets. These precision-engineered brass jets deliver reliable fuel-metering control for racing, off-road, and high-performance motorcycles. Crafted for durability and accuracy, they ensure consistent engine performance under extreme conditions.
Key Features
- Brass Construction: Resists corrosion and maintains precise flow rates in harsh environments.
- Hex Head Design: Simplifies installation and adjustment with a 4mm orifice for accurate fuel delivery.
- #430 Jet Size: Optimized for high-flow applications, ensuring proper fuel-air mixture balance.
- M5 x 0.75 Thread: Universal compatibility with MIKUNI carburetor systems for seamless integration.
- 10mm Length: Balanced design for compact installation without compromising airflow efficiency.
Why Choose This Product
These jets offer unmatched durability and precision for riders demanding peak engine performance. The brass material ensures long-term reliability, while the hex head design provides easy access for tuning. Whether you're racing or tackling rugged terrain, these jets deliver consistent fuel delivery for power and efficiency. Perfect for mechanics and enthusiasts seeking reliable, high-performance components.
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Upgrade your engine's performance with MIKUNI's F4/042-430 Hex Main Jets. These precision-engineered brass jets deliver reliable fuel-metering control for racing, off-road, and high-performance motorcycles. Crafted for durability and accuracy, they ensure consistent engine performance under extreme conditions.
Key Features
- Brass Construction: Resists corrosion and maintains precise flow rates in harsh environments.
- Hex Head Design: Simplifies installation and adjustment with a 4mm orifice for accurate fuel delivery.
- #430 Jet Size: Optimized for high-flow applications, ensuring proper fuel-air mixture balance.
- M5 x 0.75 Thread: Universal compatibility with MIKUNI carburetor systems for seamless integration.
- 10mm Length: Balanced design for compact installation without compromising airflow efficiency.
Why Choose This Product
These jets offer unmatched durability and precision for riders demanding peak engine performance. The brass material ensures long-term reliability, while the hex head design provides easy access for tuning. Whether you're racing or tackling rugged terrain, these jets deliver consistent fuel delivery for power and efficiency. Perfect for mechanics and enthusiasts seeking reliable, high-performance components.| SKU | GMCC1C4276 |
|---|---|
| MPN | F4/042-430 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various | Mikuni TM/VM series carbureted motorcycles, ATVs | 1980-2025 |
| Suzuki | DR-Z400, RM250/450 | 1990-2010 |
| Yamaha | XT250, YZ250/450 | 1985-2020 |
| Kawasaki | KX250/450, KLX300 | 1995-2015 |
| Honda | CRF250/450, XR400 | 2000-2025 |
Frequently Asked Questions
Fits most Mikuni TM, VM, BS series carbs with 4/042 threading, including PDS38/40, TM38/40/42.
Universal; #430 size typically for higher altitude or modified intakes/exhausts. Use jet kit calculator for precise sizing.
Hex jets have wrench flats for easier installation/removal; same flow specs as round.
Single jets available for fine-tuning; kits include range of sizes for complete rejetting.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Flathead screwdriver
- 12mm socket or wrench
Pro Tips
- Use carb cleaner to remove old debris. Always rejet in sets for balanced flow. Verify clip position on needle
Common Mistakes to Avoid
- Not cleaning jet seat before install
- Installing wrong size jet
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for aftermarket Mikuni carbs; identical to factory jets
Improvements
- Precision machined for consistent fuel flow
- Hex head prevents rounding during removal
Considerations
- None; matches OEM specs exactly
Durability & Warranty
Expected Lifespan
Indefinite with proper maintenance; does not wear out
Warranty
Limited lifetime from Mikuni
Maintenance
Inspect/clean during carb service (every 20-50 hours)
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