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Start ShoppingMIKUNI F4/042-720 Hex Main Jets - Precision Fuel Control for High-Performance Engines
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Description
Upgrade your engine's fuel delivery system with MIKUNI's precision-engineered F4/042-720 Hex Main Jets. These critical components ensure optimal air-fuel mixture for enhanced power, responsiveness, and reliable performance across a range of powersports applications.
Key Features
- Hexagonal Design: Ensures secure, leak-free installation in MIKUNI carburetor systems
- High-Precision Machining: Maintains consistent fuel flow for smooth throttle response
- Material Durability: Made from corrosion-resistant brass for long-lasting performance
- Compatibility: Specifically designed for MIKUNI F4 series carburetors
Why Choose This Product
These main jets are essential for fine-tuning engine performance, allowing riders to achieve better fuel efficiency, improved acceleration, and consistent power delivery. The hex design ensures easy installation and secure fitment, while the durable construction withstands high-temperature environments. Perfect for both stock and modified engines, these jets provide the foundation for precise fuel metering in powersports vehicles.
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Upgrade your engine's fuel delivery system with MIKUNI's precision-engineered F4/042-720 Hex Main Jets. These critical components ensure optimal air-fuel mixture for enhanced power, responsiveness, and reliable performance across a range of powersports applications.
Key Features
- Hexagonal Design: Ensures secure, leak-free installation in MIKUNI carburetor systems
- High-Precision Machining: Maintains consistent fuel flow for smooth throttle response
- Material Durability: Made from corrosion-resistant brass for long-lasting performance
- Compatibility: Specifically designed for MIKUNI F4 series carburetors
Why Choose This Product
These main jets are essential for fine-tuning engine performance, allowing riders to achieve better fuel efficiency, improved acceleration, and consistent power delivery. The hex design ensures easy installation and secure fitment, while the durable construction withstands high-temperature environments. Perfect for both stock and modified engines, these jets provide the foundation for precise fuel metering in powersports vehicles.
| SKU | GM08885FEA |
|---|---|
| MPN | F4/042-720 |
| Brand | MIKUNI |
| Category | Jets |
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Frequently Asked Questions
The main jet controls fuel flow at mid-range to full throttle operation. It's one of the primary tuning components in a carburetor.
Consult your carburetor's service manual or your motorcycle/ATV manual. Jet size depends on altitude, temperature, engine modifications, and carburetor model. Common sizes range from 300-800.
Hex jets are easier to install and remove with standard hex wrenches or sockets. They're less likely to strip compared to slotted jets which can be damaged by screwdriver tips.
No. Different Mikuni carburetors have different jet passages and thread sizes. Verify compatibility with your specific carburetor model before purchasing.
Jets typically don't wear out and can be reused. Replace them only if damaged, clogged beyond cleaning, or if you're changing your jetting for tuning purposes.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- Hex wrench or socket (size depends on jet head)
- Carburetor removal tools (if full carb service)
- Clean workspace
- Gasket scraper (plastic preferred)
Pro Tips
- Gently snug the jet - do not force it
- Clean jet passages with carburetor cleaner before installation
- Keep jets organized by size to avoid mixing them up
- Take photos during disassembly to aid reassembly
- The hex design makes these easier to install than slotted jets
Common Mistakes to Avoid
- Over-tightening the jet, which can strip threads or crack the jet
- Not cleaning the jet passage before installation
- Installing wrong jet size for your application
- Forgetting to replace carburetor gaskets during service
Durability & Warranty
Expected Lifespan
Indefinite if not damaged - jets don't typically wear out
Warranty
Typically covered under manufacturer defect warranty (varies by retailer)
Maintenance
Clean with carburetor cleaner if clogged. Do not use wire brushes that could damage the jet orifice.
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