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Start ShoppingMIKUNI FJ8-6F04 Jet Needle - Precision Fuel Delivery for Carburetors
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Description
Upgrade your powersports engine's fuel delivery system with the MIKUNI FJ8-6F04 Jet Needle. This precision-engineered component ensures optimal fuel-air mixture for improved power, efficiency, and engine responsiveness across a range of riding conditions.
Key Features
- Exact Fitment: Designed for MIKUNI carburetors to ensure seamless integration and reliable performance.
- High-Durability Construction: Precision-machined for long-lasting operation in demanding off-road and on-road environments.
- Enhanced Fuel Flow: Optimized needle geometry delivers consistent fuel delivery for smoother throttle response.
- Easy Installation: Simple replacement process with minimal tools required for quick setup.
Why Choose This Product
Whether you're tackling rugged trails or cruising on the highway, the MIKUNI FJ8-6F04 Jet Needle delivers the precision needed to maintain peak engine performance. Its durable construction resists wear from fuel and environmental factors, while its exact fitment ensures compatibility with MIKUNI carburetor systems. Riders will notice improved throttle control, better fuel efficiency, and reduced engine hesitation—making it an essential upgrade for serious powersports enthusiasts.
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Upgrade your powersports engine's fuel delivery system with the MIKUNI FJ8-6F04 Jet Needle. This precision-engineered component ensures optimal fuel-air mixture for improved power, efficiency, and engine responsiveness across a range of riding conditions.
Key Features
- Exact Fitment: Designed for MIKUNI carburetors to ensure seamless integration and reliable performance.
- High-Durability Construction: Precision-machined for long-lasting operation in demanding off-road and on-road environments.
- Enhanced Fuel Flow: Optimized needle geometry delivers consistent fuel delivery for smoother throttle response.
- Easy Installation: Simple replacement process with minimal tools required for quick setup.
Why Choose This Product
Whether you're tackling rugged trails or cruising on the highway, the MIKUNI FJ8-6F04 Jet Needle delivers the precision needed to maintain peak engine performance. Its durable construction resists wear from fuel and environmental factors, while its exact fitment ensures compatibility with MIKUNI carburetor systems. Riders will notice improved throttle control, better fuel efficiency, and reduced engine hesitation—making it an essential upgrade for serious powersports enthusiasts.
| SKU | GM2B831AB0 |
|---|---|
| MPN | FJ8-6F04 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Yamaha | YZ450F | 2008-2018 |
| Yamaha | WR450F | 2009-2019 |
| Kawasaki | KX450F | 2010-2020 |
Frequently Asked Questions
The jet needle controls the fuel-air mixture during mid-range throttle openings (approximately 1/8 to 1/2 throttle). It works with the main jet and pilot jet to optimize performance across the throttle range.
Signs include rough idle, hesitation during acceleration, poor mid-range performance, or visible wear/damage to the needle tip. If your carburetor is being rebuilt, the needle should be replaced as part of routine maintenance.
This needle is designed for Mikuni FJ8 series carburetors. You must verify your carburetor model matches before purchasing. Check your carburetor body or consult your vehicle's service manual.
Yes. Moving the clip up (toward the blunt end) leans the mixture; moving it down (toward the tapered end) richens the mixture. Typical adjustments are 1-2 positions at a time.
Different needle models have varying taper profiles and diameters, affecting fuel flow at different throttle positions. The FJ8-6F04 is specific to FJ8 carburetors and cannot be substituted with other Mikuni needle models.
Installation Guide
Difficulty
Medium
Est. Time
20 min
Tools Required
- Small screwdrivers (Phillips and flat-head)
- Carburetor cleaning tools
- Gasket scraper
- Clean workspace
Pro Tips
- Take photos during disassembly for reference
- Clean all carburetor passages while disassembled
- Verify needle clip position matches your jetting requirements
- Test idle and throttle response after installation
Common Mistakes to Avoid
- Not properly cleaning carburetor before reassembly
- Damaging needle seat during removal
- Incorrect needle position/clip placement
- Not checking fuel flow after installation
Comparison vs Stock/OEM
Replacement for worn or damaged original needle
Improvements
- Restores original performance characteristics
- Precision-manufactured to OEM specifications
- Proper taper profile for FJ8 carburetor design
Considerations
- Must be paired with correct main and pilot jets for optimal performance
- Performance depends on overall carburetor tuning
Durability & Warranty
Expected Lifespan
5-10 years typical with proper maintenance; longer if carburetor is kept clean
Warranty
Typically covered under manufacturer warranty if defective
Maintenance
No ongoing maintenance required; inspect during carburetor service for wear or damage
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