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Start ShoppingMIKUNI F4/042-410 Hex Main Jet - Brass Fuel Jet for High-Performance Engines
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Description
Upgrade your Mikuni carburetor's fuel delivery system with this precision-engineered Hex Main Jet. Crafted from durable brass, this essential component ensures consistent fuel flow for maximum power and efficiency in two-stroke and four-stroke engines.
Key Features
- Brass Construction: Resists corrosion and maintains precise fuel metering under extreme conditions
- Hex Head Design: Simplifies jet removal/installation with standard tools for quick maintenance
- Exact Fitment: Specifically engineered for Mikuni carburetor systems requiring F4/042-410 specifications
Why Choose This Product
This Hex Main Jet delivers exceptional performance through its durable brass construction and precision-machined hex head design. Riders benefit from improved fuel efficiency, consistent engine response, and reduced maintenance downtime. The straightforward installation process makes it ideal for both professional mechanics and DIY enthusiasts looking to optimize their powersports equipment's performance.
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Upgrade your Mikuni carburetor's fuel delivery system with this precision-engineered Hex Main Jet. Crafted from durable brass, this essential component ensures consistent fuel flow for maximum power and efficiency in two-stroke and four-stroke engines.
Key Features
- Brass Construction: Resists corrosion and maintains precise fuel metering under extreme conditions
- Hex Head Design: Simplifies jet removal/installation with standard tools for quick maintenance
- Exact Fitment: Specifically engineered for Mikuni carburetor systems requiring F4/042-410 specifications
Why Choose This Product
This Hex Main Jet delivers exceptional performance through its durable brass construction and precision-machined hex head design. Riders benefit from improved fuel efficiency, consistent engine response, and reduced maintenance downtime. The straightforward installation process makes it ideal for both professional mechanics and DIY enthusiasts looking to optimize their powersports equipment's performance.
| SKU | GMCADCB3CB |
|---|---|
| MPN | F4/042-410 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Yamaha | XT250, TTR125, YZ125/250, WR250 | 1980-2025 |
| Various Honda | CRF150R, XR250R, XL250 | 1970-2025 |
| Various Kawasaki | KLX250, KX125/250 | 1980-2025 |
| Various Suzuki | DR-Z400, RM125/250 | 1975-2025 |
Frequently Asked Questions
This is MIKUNI's part numbering system. F4 indicates the jet type/series, 042 refers to the jet size (typically 42), and 410 is the specific variant. Consult MIKUNI documentation for exact specifications.
Jet selection depends on engine displacement, carburetor model, altitude, fuel type, and air intake modifications. Consult your engine manufacturer's jetting chart or MIKUNI's recommendations for your specific application.
No. Different MIKUNI carburetors use different jet sizes and thread types. Verify compatibility with your specific carburetor model before purchasing.
Hex jets are easier to remove and install using a wrench or socket, reducing the risk of stripping the jet or carburetor body. They're less prone to damage during service.
Main jets don't typically wear out. Replace them only when changing jetting for tuning purposes or if damaged. Clean and reuse jets during routine carburetor service.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- Hex wrench or socket matching jet size
- Carburetor removal tools (if full carb service)
- Clean workspace
- Gasket scraper (plastic preferred)
Pro Tips
- Keep jets organized by size when removing multiple jets
- Clean jet passages with carburetor cleaner before installing new jets
- Refer to jetting charts for your specific engine/altitude/fuel type
- Hex design allows easier removal than slotted jets
- Document original jet sizes before modification
Common Mistakes to Avoid
- Over-tightening the jet (can strip brass)
- Not cleaning the jet passage before installation
- Installing wrong jet size for your tuning needs
- Forgetting to replace carburetor gaskets during service
Durability & Warranty
Expected Lifespan
Indefinite if not damaged (brass doesn't wear)
Warranty
Typically covered under MIKUNI's standard warranty; verify with retailer
Maintenance
Clean with carburetor cleaner during service; inspect for cracks or damage
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