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Start ShoppingMIKUNI F4/042-165 Hex Main Jets - Precision Fuel Delivery for High-Performance Engines
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Description
Upgrade your engine's fuel delivery system with MIKUNI's F4/042-165 Hex Main Jets. These precision-engineered components ensure optimal fuel-air mixture for enhanced power, responsiveness, and consistent performance across a wide range of riding conditions.
Key Features
- Hexagonal Design: Ensures secure, leak-free installation and easy adjustment for fine-tuning fuel flow.
- High-Durability Construction: Made from premium brass for corrosion resistance and long-lasting performance in harsh environments.
- Exact Fitment: Precision-machined for seamless compatibility with MIKUNI carburetor systems.
- Performance Optimization: Regulates fuel flow for improved throttle response and engine efficiency.
Why Choose This Product
Whether you're tuning a racing engine or enhancing your daily ride, these jets deliver reliable fuel metering that prevents rich/lean conditions. Their robust build ensures consistent performance through extreme temperatures and vibrations, while the hex design simplifies maintenance. Perfect for riders seeking precise control over engine output without compromising durability.
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Upgrade your engine's fuel delivery system with MIKUNI's F4/042-165 Hex Main Jets. These precision-engineered components ensure optimal fuel-air mixture for enhanced power, responsiveness, and consistent performance across a wide range of riding conditions.
Key Features
- Hexagonal Design: Ensures secure, leak-free installation and easy adjustment for fine-tuning fuel flow.
- High-Durability Construction: Made from premium brass for corrosion resistance and long-lasting performance in harsh environments.
- Exact Fitment: Precision-machined for seamless compatibility with MIKUNI carburetor systems.
- Performance Optimization: Regulates fuel flow for improved throttle response and engine efficiency.
Why Choose This Product
Whether you're tuning a racing engine or enhancing your daily ride, these jets deliver reliable fuel metering that prevents rich/lean conditions. Their robust build ensures consistent performance through extreme temperatures and vibrations, while the hex design simplifies maintenance. Perfect for riders seeking precise control over engine output without compromising durability.
| SKU | GM2101ADC1 |
|---|---|
| MPN | F4/042-165 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Multiple | VM series carburetors (VM26-428, VM30-89, VM34-394, etc.) | 1980-2025 |
| Honda | CRF250R, CRF450R, XR series | 1990-2025 |
| Yamaha | YZ, WR, TTR series | 1985-2025 |
| Suzuki | RM, DRZ series | 1980-2025 |
| Kawasaki | KX, KLX series | 1995-2025 |
Frequently Asked Questions
Fits Mikuni VM series round slide carburetors (VM24, VM26, VM28, VM30, VM32, VM34, VM36, VM38, VM40). Confirm your carb model.
Check your current jet size (usually stamped on the side). Use jetting charts based on elevation, temperature, and modifications.
This is genuine OEM Mikuni part number F4/042-165. Avoid generic jets.
No, main jets can usually be changed with carb on bike using 12mm socket.
Correct jet size optimizes fuel/air mixture for your specific conditions and modifications.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- 12mm socket or wrench
- Carb cleaner
- Compressed air
Pro Tips
- Clean carburetor thoroughly before installing new jet
- Use carb cleaner and compressed air to clear passages
- Always check needle clip position when changing main jet
- Mark your original jet size before removal
Common Mistakes to Avoid
- Not cleaning jet seat thoroughly
- Cross-threading the jet
- Not verifying float height after jet change
Comparison vs Stock/OEM
Direct OEM replacement for factory Mikuni carburetors
Improvements
- Precision machined brass for consistent fuel flow
- Proper orifice sizing for optimal performance
- Genuine Mikuni quality control
Considerations
- Must match your specific tuning requirements
Durability & Warranty
Expected Lifespan
Engine rebuild or 5+ years typical
Warranty
Mikuni lifetime warranty against manufacturing defects
Maintenance
Inspect during carb cleaning, replace when tuning
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