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Start ShoppingMIKUNI FN100604-142.5 Large Round Main Jets - Precision Fuel Control for High-Performance Engines
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Description
Achieve perfect fuel-air mixture balance with MIKUNI's Large Round Main Jets, engineered for precision fuel delivery in high-performance engines. These critical components ensure consistent power output and reliable operation across a range of riding conditions.
Key Features
- Precision Engineering: CNC-machined brass construction ensures accurate fuel flow rates for optimal engine performance.
- Durable Material: Corrosion-resistant brass withstands harsh environments while maintaining precise fuel metering.
- Universal Compatibility: Designed to fit standard MIKUNI carburetor setups for easy installation and maintenance.
- Performance Optimization: Fine-tuned orifice sizing delivers consistent fuel delivery across varying throttle positions.
Why Choose This Product
These main jets are essential for riders seeking maximum engine efficiency and power output. Their precise fuel metering capabilities help prevent engine hesitation, improve throttle response, and ensure smooth operation under heavy load. The durable brass construction resists clogging and wear, reducing maintenance needs and extending service life. Whether you're modifying a sport bike or tuning a racing engine, these jets provide the accuracy needed for professional-level performance.
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Achieve perfect fuel-air mixture balance with MIKUNI's Large Round Main Jets, engineered for precision fuel delivery in high-performance engines. These critical components ensure consistent power output and reliable operation across a range of riding conditions.
Key Features
- Precision Engineering: CNC-machined brass construction ensures accurate fuel flow rates for optimal engine performance.
- Durable Material: Corrosion-resistant brass withstands harsh environments while maintaining precise fuel metering.
- Universal Compatibility: Designed to fit standard MIKUNI carburetor setups for easy installation and maintenance.
- Performance Optimization: Fine-tuned orifice sizing delivers consistent fuel delivery across varying throttle positions.
Why Choose This Product
These main jets are essential for riders seeking maximum engine efficiency and power output. Their precise fuel metering capabilities help prevent engine hesitation, improve throttle response, and ensure smooth operation under heavy load. The durable brass construction resists clogging and wear, reducing maintenance needs and extending service life. Whether you're modifying a sport bike or tuning a racing engine, these jets provide the accuracy needed for professional-level performance.| SKU | GMBB61280A |
|---|---|
| MPN | FN100604-142.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Yamaha, Suzuki, Kawasaki, Honda) | Carbureted motorcycles/ATVs with Mikuni VM/PF series carbs | 1980-2025 |
| Honda | XR series (XR250R, XR400R, XR650R) | 1990-2010 |
| Yamaha | XT series (XT250, XT600), YZ/WR dirt bikes | 1985-2020 |
| Suzuki | DR-Z400, RM series | 1995-2015 |
Frequently Asked Questions
Fits Mikuni VM, BS, and PF series carbs (VM26 to VM34, etc.). Check your carb markings.
Use jetting charts based on altitude, temperature, mods (exhaust/air filter). Start with stock size +/- 2-5 points.
This is main jet only. Pilot jets are smaller (e.g., Mikuni N100.104 series).
No, carbureted bikes only.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet needle holder (optional)
- Carb cleaning kit
Pro Tips
- Clean jet thoroughly before install. Test plug chop method for tuning confirmation. Carry spare jets for altitude changes.
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing wrong jet size without testing
- Overlooking float height adjustment
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for worn jets; precise brass machining matches or exceeds factory specs
Improvements
- Consistent fuel flow for better tuning
- Corrosion resistant
- Ideal for performance mods
Considerations
- Requires dyno/tuning for optimal results; not plug-and-play without testing
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning; replace if clogged or damaged
Warranty
Limited lifetime (Mikuni standard)
Maintenance
Clean with carb cleaner every service; inspect during air filter changes
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