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Start ShoppingMIKUNI F4/042-65 Hex Main Jets - Precision Fuel Metering for High-Performance Engines
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Description
Upgrade your engine's fuel delivery system with MIKUNI's F4/042-65 Hex Main Jets. These precision-engineered components deliver optimal fuel-air mixture for enhanced power, responsiveness, and fuel efficiency in two-stroke and four-stroke engines.
Key Features
- 042-65 (#65) Size: Calibrated for precise fuel metering at main jet circuit, ensuring peak engine performance across a wide range of operating conditions.
- Brass Material: Durable, corrosion-resistant construction withstands high temperatures and fuel exposure for long-lasting reliability.
- Hex Head Thread: Easy installation and adjustment with standard hex tools, reducing maintenance time and effort.
- Calibrated Flow Rate: Fine-tuned fuel flow ensures consistent performance, improving throttle response and fuel efficiency.
Why Choose This Product
MIKUNI's Hex Main Jets offer unmatched precision and durability for riders seeking maximum engine performance. The brass construction resists wear and corrosion, while the hex thread design simplifies maintenance. Perfect for tuning and maintaining high-performance engines in motorcycles, ATVs, and off-road vehicles. Whether you're racing or riding recreationally, these jets deliver reliable fuel metering for smoother power delivery and extended engine life.
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Upgrade your engine's fuel delivery system with MIKUNI's F4/042-65 Hex Main Jets. These precision-engineered components deliver optimal fuel-air mixture for enhanced power, responsiveness, and fuel efficiency in two-stroke and four-stroke engines.
Key Features
- 042-65 (#65) Size: Calibrated for precise fuel metering at main jet circuit, ensuring peak engine performance across a wide range of operating conditions.
- Brass Material: Durable, corrosion-resistant construction withstands high temperatures and fuel exposure for long-lasting reliability.
- Hex Head Thread: Easy installation and adjustment with standard hex tools, reducing maintenance time and effort.
- Calibrated Flow Rate: Fine-tuned fuel flow ensures consistent performance, improving throttle response and fuel efficiency.
Why Choose This Product
MIKUNI's Hex Main Jets offer unmatched precision and durability for riders seeking maximum engine performance. The brass construction resists wear and corrosion, while the hex thread design simplifies maintenance. Perfect for tuning and maintaining high-performance engines in motorcycles, ATVs, and off-road vehicles. Whether you're racing or riding recreationally, these jets deliver reliable fuel metering for smoother power delivery and extended engine life.| SKU | GM7E14E999 |
|---|---|
| MPN | F4/042-65 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (e.g., Honda XR series, Yamaha YZ/WR, Kawasaki KX, Suzuki RM) | 1985-2025 |
| Honda | CRF250R, CRF450R | 1990-2010 |
| Yamaha | XT250, TT-R series | 1980-2020 |
Frequently Asked Questions
Fits most Mikuni round-slide carbs like VM26-VM34, BS32/36, PD series. Check your carb model.
Use a jet kit or dyno tune. #65 is common for mid-range tuning at sea level with stock exhaust.
Hex jets are easier to remove without special tools; same flow as round jets of same size.
Usually yes, but verify thread size; some conversions require adapter.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Jet wrench or needle nose pliers
Pro Tips
- Always record stock jet size before swapping. Clean jets with carb cleaner before install. Test in stages (1 size at a time)
Common Mistakes to Avoid
- Not cleaning carb bowl before install
- Installing without noting original jet size
Comparison vs Stock/OEM
Aftermarket Mikuni precision-machined vs OEM variable tolerance
Improvements
- More consistent fuel flow
- Easier tuning increments
- Corrosion-resistant brass
Considerations
- Requires proper jetting knowledge; not plug-and-play
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning (carb service every 20-50 hours)
Warranty
Limited lifetime against manufacturing defects
Maintenance
Remove and clean during every carb cleaning; inspect for wear/clogging
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