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Start ShoppingMIKUNI FN102221-127.5 High Speed Jet - Precision Fuel Delivery for Power & Performance
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Description
Elevate your engine's performance with the MIKUNI FN102221-127.5 High Speed Jet, engineered for precision fuel metering in high-output power sports equipment. This critical component ensures optimal air-fuel ratios for maximum horsepower and responsive throttle control.
Key Features
- High-Speed Fuel Metering: Advanced design for consistent fuel delivery at extreme RPMs
- Durable Brass Construction: Resists corrosion and maintains accuracy in harsh environments
- Universal Compatibility: Fits most 2-stroke and 4-stroke engines with standard carburetor setups
- Easy Installation: Plug-and-play design with no special tools required
- Adjustable Orifice: Fine-tune fuel flow for specific riding conditions and engine modifications
Why Choose This Product
Upgrade your power sports equipment with a jet that delivers unmatched reliability and performance. The FN102221-127.5's precision engineering ensures consistent power output, improved fuel efficiency, and smoother engine response. Whether you're racing or exploring rugged terrain, this jet provides the reliability needed for demanding applications. Its corrosion-resistant materials ensure long-term durability, while the adjustable orifice allows customization for peak performance.
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Elevate your engine's performance with the MIKUNI FN102221-127.5 High Speed Jet, engineered for precision fuel metering in high-output power sports equipment. This critical component ensures optimal air-fuel ratios for maximum horsepower and responsive throttle control.
Key Features
- High-Speed Fuel Metering: Advanced design for consistent fuel delivery at extreme RPMs
- Durable Brass Construction: Resists corrosion and maintains accuracy in harsh environments
- Universal Compatibility: Fits most 2-stroke and 4-stroke engines with standard carburetor setups
- Easy Installation: Plug-and-play design with no special tools required
- Adjustable Orifice: Fine-tune fuel flow for specific riding conditions and engine modifications
Why Choose This Product
Upgrade your power sports equipment with a jet that delivers unmatched reliability and performance. The FN102221-127.5's precision engineering ensures consistent power output, improved fuel efficiency, and smoother engine response. Whether you're racing or exploring rugged terrain, this jet provides the reliability needed for demanding applications. Its corrosion-resistant materials ensure long-term durability, while the adjustable orifice allows customization for peak performance.| SKU | GM5FC518AE |
|---|---|
| MPN | FN102221-127.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various | Mikuni TM/VM series carbureted motorcycles, ATVs | 1980-2025 |
Frequently Asked Questions
Fits Mikuni TM, VM, BS series carbs with #102 main jet holder. Check your carb model.
Use plug chop test or EGT gauge. 127.5 is common for mid-high altitude or modified intakes/exhausts.
Yes, genuine Mikuni part, not aftermarket.
Carb jetting changes are common mods; unlikely to affect warranty unless racing.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench or needle-nose pliers
Pro Tips
- Remove carb, unscrew old main jet from emulsion tube. Clean with carb cleaner. Test plug chop method to verify jetting after install.
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet size selection without testing
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for stock Mikuni jets
Improvements
- Precise fuel metering for optimal A/F ratio
- Better throttle response and power delivery when properly sized
Considerations
- Must match engine mods/environment; too rich/lean can harm engine
Durability & Warranty
Expected Lifespan
Entire carb life if not exposed to contaminants; 2+ years typical
Warranty
Mikuni lifetime warranty against defects
Maintenance
Inspect/clean during annual carb service; replace if deformed/clogged
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