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Start ShoppingMIKUNI F4/042-210 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 precision-engineered F4/042-210 Hex Main Jets. These critical components ensure optimal fuel-air mixture ratios for enhanced power, efficiency, and responsiveness in high-performance powersports engines.
Key Features
- Hexagonal Design: Ensures secure, leak-free installation in carburetor systems
- Material Quality: Durable brass construction resists corrosion and maintains precision over time
- Compatibility: Specifically engineered for MIKUNI carburetor systems with F4/042-210 specifications
- Adjustable Flow: Allows fine-tuning of fuel delivery for different riding conditions
Why Choose This Product
MIKUNI main jets deliver unmatched reliability and performance for powersports enthusiasts. Their precision manufacturing ensures consistent fuel flow, while the hexagonal design provides easy installation and secure fitment. These jets are essential for maintaining peak engine performance, improving throttle response, and achieving optimal fuel efficiency in motorcycles, ATVs, and other off-road vehicles.
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Upgrade your engine's fuel delivery system with MIKUNI's precision-engineered F4/042-210 Hex Main Jets. These critical components ensure optimal fuel-air mixture ratios for enhanced power, efficiency, and responsiveness in high-performance powersports engines.
Key Features
- Hexagonal Design: Ensures secure, leak-free installation in carburetor systems
- Material Quality: Durable brass construction resists corrosion and maintains precision over time
- Compatibility: Specifically engineered for MIKUNI carburetor systems with F4/042-210 specifications
- Adjustable Flow: Allows fine-tuning of fuel delivery for different riding conditions
Why Choose This Product
MIKUNI main jets deliver unmatched reliability and performance for powersports enthusiasts. Their precision manufacturing ensures consistent fuel flow, while the hexagonal design provides easy installation and secure fitment. These jets are essential for maintaining peak engine performance, improving throttle response, and achieving optimal fuel efficiency in motorcycles, ATVs, and other off-road vehicles.| SKU | GMACBCCE7B |
|---|---|
| MPN | F4/042-210 |
| Brand | MIKUNI |
| Category | Jets |
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Frequently Asked Questions
The main jet controls fuel flow at mid-to-high throttle positions. It affects engine performance, fuel economy, and throttle response in the mid-range RPM band.
Signs of incorrect jetting include: running too lean (hesitation, popping on decel, overheating) or too rich (black spark plug, poor fuel economy, fouling). Jet size increases by 5-10 increments (e.g., 200, 210, 220). Consult your carburetor manual or tuning guide for your specific application.
Hex jets have a flat-sided head for easier removal/installation with a wrench or socket. Non-hex jets require a jet removal tool. Hex design is more convenient for tuning.
No. The F4/042-210 is specific to certain Mikuni models. Verify your carburetor model number matches the jet specification. Using wrong jets can cause poor performance or damage.
Usually yes. Most carburetors require removal to access the main jet safely. Some applications may allow access without full removal, but this varies by model.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Hex wrench or socket (size depends on jet head)
- Carburetor removal may be necessary
- Small container for small parts
Pro Tips
- Work on a clean surface to avoid losing small parts
- Take a photo before disassembly for reference
- Gently snug the jet - brass is soft and strips easily
- Keep jets organized by size if testing multiple sizes
- Clean the jet seat in the carburetor before installing new jet
Common Mistakes to Avoid
- Over-tightening the jet (can strip brass)
- Losing the small jet during removal
- Not properly seating the jet before tightening
- Mixing up main jet with pilot jet
Durability & Warranty
Expected Lifespan
Indefinite if not damaged. Brass jets don't wear out but can become clogged with fuel varnish
Warranty
Typically no warranty on jets (consumable tuning parts)
Maintenance
Clean periodically if carburetor is serviced. Replace if damaged or stripped.
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