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Start ShoppingMikuni FN102221-172.5 High-Speed Jet - Precision Fuel Delivery for Power & Performance
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Description
Elevate your powersports performance with the Mikuni FN102221-172.5 High-Speed Jet, engineered for precision fuel delivery that maximizes engine power and efficiency. This critical component is designed to deliver consistent performance in high-speed applications, ensuring reliable operation under demanding conditions.
Key Features
- High-Speed Optimization: Precision-engineered for maximum airflow and fuel efficiency at high RPMs.
- Durable Construction: Made from corrosion-resistant materials for long-lasting performance in harsh environments.
- Easy Adjustment: Simple setup allows for quick tuning to match engine specifications and riding conditions.
- Universal Compatibility: Designed to fit a wide range of powersports engines for versatile use.
Why Choose This Product
Whether you're racing or exploring, this jet ensures your engine runs at peak efficiency. Its durable build withstands extreme conditions, while the precise fuel metering enhances throttle response and power output. The straightforward installation and adjustment make it a rider's favorite for maintaining optimal performance.
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Elevate your powersports performance with the Mikuni FN102221-172.5 High-Speed Jet, engineered for precision fuel delivery that maximizes engine power and efficiency. This critical component is designed to deliver consistent performance in high-speed applications, ensuring reliable operation under demanding conditions.
Key Features
- High-Speed Optimization: Precision-engineered for maximum airflow and fuel efficiency at high RPMs.
- Durable Construction: Made from corrosion-resistant materials for long-lasting performance in harsh environments.
- Easy Adjustment: Simple setup allows for quick tuning to match engine specifications and riding conditions.
- Universal Compatibility: Designed to fit a wide range of powersports engines for versatile use.
Why Choose This Product
Whether you're racing or exploring, this jet ensures your engine runs at peak efficiency. Its durable build withstands extreme conditions, while the precise fuel metering enhances throttle response and power output. The straightforward installation and adjustment make it a rider's favorite for maintaining optimal performance.
| SKU | GM5418FFF3 |
|---|---|
| MPN | FN102221-172.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Honda | CRF450R | 2008-2024 |
| Kawasaki | KX450F | 2010-2024 |
| Yamaha | YZ450F | 2007-2024 |
| Suzuki | RMZ450 | 2009-2024 |
| KTM | 450 SX-F | 2010-2024 |
Frequently Asked Questions
Main jet size depends on your carb model, exhaust, air filter, altitude, temperature, and riding style. Start with manufacturer jetting chart and adjust 2-3 sizes at a time based on plug reads.
No, Mikuni FN series jets have different threading than Keihin jets. Check your carburetor model - VM series carbs use Mikuni jets.
Usually yes - changing main jet often requires adjusting pilot jet, needle position, and air screw for proper fueling across the throttle range.
Tan/light brown insulator = correct. White/gray = lean (go bigger jet). Black/wet = rich (go smaller jet). Check at wide open throttle after heat cycle.
Main jet controls fuel 3/4-fully open throttle (high speed). Needle jet affects mid-range with needle position.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- 4mm Allen wrench
- small flathead screwdriver
- jet cleaner tool
- compressed air
Pro Tips
- Use carb cleaner and compressed air to clean all passages
- Check needle clip position when changing main jet
- Make small changes (2.5-5 sizes) and test ride between adjustments
- Record your baseline jetting before changes
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing without removing old jet completely
- Not verifying float height after jet change
Comparison vs Stock/OEM
Direct OEM replacement or performance upgrade for stock Mikuni carbs
Improvements
- Precision machined brass for consistent fuel flow
- Better high-RPM fuel delivery than worn stock jets
- Enables tuning for aftermarket modifications
Considerations
- Requires proper jetting procedure
- Not a 'bolt-on' performance part
Durability & Warranty
Expected Lifespan
Entire carburetor life with proper maintenance
Warranty
Mikuni lifetime warranty against manufacturing defects
Maintenance
Inspect for debris annually, replace if clogged or damaged
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