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Start ShoppingMIKUNI FJ8-6FM46 Jet Needle - High-Precision Brass Carburetor Needle for Powersports Engines
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Description
Upgrade your carburetor's fuel delivery precision with this MIKUNI FJ8-6FM46 Jet Needle. Engineered for high-performance powersports engines, this high-precision brass needle ensures consistent fuel metering and reliable operation under demanding conditions.
Key Features
- High-Precision Machined Brass: Durable, corrosion-resistant construction for long-lasting performance in harsh environments.
- 5 Clip Positions: Fine-tune fuel delivery settings to match engine requirements and riding conditions.
- 2.25" Tapered Needle Profile: Optimized flow characteristics for smooth throttle response and power delivery.
- OEM-Grade Compatibility: Precision-engineered to fit original equipment specifications for seamless integration.
Why Choose This Product
Whether you're tuning a high-performance motorcycle or off-road vehicle, this jet needle delivers unmatched accuracy and reliability. The brass material resists deformation from fuel and heat, while the adjustable clip positions allow customization for different fuel mixtures and engine loads. Its tapered design ensures consistent fuel flow across RPM ranges, enhancing both power output and fuel efficiency. As a direct replacement for OEM parts, this needle offers a cost-effective way to maintain peak carburetor performance without compromising quality.
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Upgrade your carburetor's fuel delivery precision with this MIKUNI FJ8-6FM46 Jet Needle. Engineered for high-performance powersports engines, this high-precision brass needle ensures consistent fuel metering and reliable operation under demanding conditions.
Key Features
- High-Precision Machined Brass: Durable, corrosion-resistant construction for long-lasting performance in harsh environments.
- 5 Clip Positions: Fine-tune fuel delivery settings to match engine requirements and riding conditions.
- 2.25" Tapered Needle Profile: Optimized flow characteristics for smooth throttle response and power delivery.
- OEM-Grade Compatibility: Precision-engineered to fit original equipment specifications for seamless integration.
Why Choose This Product
Whether you're tuning a high-performance motorcycle or off-road vehicle, this jet needle delivers unmatched accuracy and reliability. The brass material resists deformation from fuel and heat, while the adjustable clip positions allow customization for different fuel mixtures and engine loads. Its tapered design ensures consistent fuel flow across RPM ranges, enhancing both power output and fuel efficiency. As a direct replacement for OEM parts, this needle offers a cost-effective way to maintain peak carburetor performance without compromising quality.| SKU | GM4DAB6F47 |
|---|---|
| MPN | FJ8-6FM46 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Yamaha | YZ450F | 2008-2012 |
| Yamaha | WR450F | 2009-2013 |
| Kawasaki | KX450F | 2006-2010 |
Frequently Asked Questions
Fits Mikuni TM40 pumper carbs on Yamaha YZ/WR450F and similar Keihin-compatible setups.
Start with stock position (usually 3rd groove). Adjust richer (lower) for lean conditions or leaner (higher) for rich.
Mikuni FJ8-6FM46 is the direct OEM jet needle for specified Yamaha models.
Provides precise fueling; best used as part of full jet kit tuning.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Needle nose pliers
Pro Tips
- Note clip position before removal. Test jetting in safe area after install.
Common Mistakes to Avoid
- Installing clip in wrong groove
- Not cleaning carb slide before install
Comparison vs Stock/OEM
This is the genuine Mikuni/OEM jet needle (Yamaha PN 5J6-14142-00-00)
Improvements
- Factory-spec precision machining
- 5 clip positions for tuning
Considerations
- None - identical to stock
Durability & Warranty
Expected Lifespan
Entire carb life with proper jetting (3-5+ years)
Warranty
Mikuni lifetime against manufacturing defects
Maintenance
Inspect during annual carb cleaning; replace if bent or grooved
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