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Start ShoppingMIKUNI F4/042-150 Hex Main Jets - Precision Brass Carburetor Jet for High-Performance Engines
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Description
Upgrade your carburetor's fuel delivery system with MIKUNI's F4/042-150 Hex Main Jets. These precision-engineered brass jets deliver consistent fuel flow for responsive engine performance, making them essential for riders seeking reliable power output and smooth throttle response.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding riding conditions.
- #150 Calibrated Size: Precisely engineered for optimal fuel-air mixture balance in high-performance engines.
- Hex Head Thread: Secure, leak-free installation with standard hex wrench compatibility.
- Flow Rate Optimization: Fine-tuned fuel delivery for enhanced engine efficiency and power output.
- Compact Dimensions: 0.25in diameter x 0.5in length for easy installation and minimal clearance requirements.
Why Choose This Product
MIKUNI's F4/042-150 jets combine precision manufacturing with reliable performance, delivering consistent fuel flow for improved throttle response and engine efficiency. The brass material resists clogging and corrosion, while the hex thread design ensures a secure fit. Perfect for motocross, off-road, and performance street bikes, these jets provide the accuracy needed for competitive riding and tuning.
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Upgrade your carburetor's fuel delivery system with MIKUNI's F4/042-150 Hex Main Jets. These precision-engineered brass jets deliver consistent fuel flow for responsive engine performance, making them essential for riders seeking reliable power output and smooth throttle response.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding riding conditions.
- #150 Calibrated Size: Precisely engineered for optimal fuel-air mixture balance in high-performance engines.
- Hex Head Thread: Secure, leak-free installation with standard hex wrench compatibility.
- Flow Rate Optimization: Fine-tuned fuel delivery for enhanced engine efficiency and power output.
- Compact Dimensions: 0.25in diameter x 0.5in length for easy installation and minimal clearance requirements.
Why Choose This Product
MIKUNI's F4/042-150 jets combine precision manufacturing with reliable performance, delivering consistent fuel flow for improved throttle response and engine efficiency. The brass material resists clogging and corrosion, while the hex thread design ensures a secure fit. Perfect for motocross, off-road, and performance street bikes, these jets provide the accuracy needed for competitive riding and tuning.| SKU | GM480DCB94 |
|---|---|
| MPN | F4/042-150 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various | Mikuni TM/VM series carbureted motorcycles/ATVs | 1980-2025 |
| Yamaha | XT600, YZ250F | 1990-2010 |
| Suzuki | DR-Z400, RM250 | 1985-2005 |
| Kawasaki | KX250, KLX300 | 1995-2015 |
Frequently Asked Questions
Fits Mikuni TM40, VM34, VM36, VM38, VM40 flat-slide and round-slide carbs commonly found on dirt bikes, ATVs, and vintage street bikes.
Yes, Mikuni F4/042-150 is an OEM hex-head main jet manufactured by Mikuni.
Often used with pilot jets, needle, and air screw adjustments for complete tuning.
Depends on engine mods, altitude, and temp. Use plug reading or wideband O2 to confirm.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet needle tool or pick
Pro Tips
- Remove carburetor float bowl first. Clean jet thoroughly. Test plug chop after install to verify jetting
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet size selection
Comparison vs Stock/OEM
Direct OEM replacement for factory Mikuni carbs
Improvements
- Precise fuel metering for performance tuning
- Adjustable sizing for mods/elevation
Considerations
- Stock jetting conservative; aftermarket needs larger jets for mods
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning
Warranty
Manufacturer defect only, typically 1 year
Maintenance
Clean with carb cleaner every service; inspect for wear/clogging
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