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Start ShoppingMIKUNI FN100604-155 Large Round Main Jets - High-Performance Fuel Jet for Powersports Engines
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Description
Upgrade your powersports engine with MIKUNI's precision-engineered Large Round Main Jets. These high-performance fuel jets deliver optimal air-fuel ratios for enhanced power, efficiency, and reliability in demanding off-road and street environments.
Key Features
- Exact Fuel Metering: Precisely calibrated for consistent fuel flow, ensuring peak engine performance across various riding conditions.
- Universal Compatibility: Designed to fit MIKUNI carburetor systems, ideal for motorcycles, ATVs, and UTVs.
- Durable Construction: Made from high-grade brass for long-lasting use and resistance to corrosion and wear.
- Easy Installation: Simple replacement for main jet adjustments without requiring complex modifications.
Why Choose This Product
These jets offer a perfect balance of precision and durability, making them essential for riders seeking to fine-tune their engine's performance. Whether you're chasing speed or maximizing fuel efficiency, MIKUNI's Large Round Main Jets provide reliable, consistent results. Their robust design ensures they withstand harsh environments, while the precise calibration helps maintain optimal engine operation. Perfect for both daily commuting and extreme off-road adventures, these jets are a must-have for serious powersports enthusiasts.
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Upgrade your powersports engine with MIKUNI's precision-engineered Large Round Main Jets. These high-performance fuel jets deliver optimal air-fuel ratios for enhanced power, efficiency, and reliability in demanding off-road and street environments.
Key Features
- Exact Fuel Metering: Precisely calibrated for consistent fuel flow, ensuring peak engine performance across various riding conditions.
- Universal Compatibility: Designed to fit MIKUNI carburetor systems, ideal for motorcycles, ATVs, and UTVs.
- Durable Construction: Made from high-grade brass for long-lasting use and resistance to corrosion and wear.
- Easy Installation: Simple replacement for main jet adjustments without requiring complex modifications.
Why Choose This Product
These jets offer a perfect balance of precision and durability, making them essential for riders seeking to fine-tune their engine's performance. Whether you're chasing speed or maximizing fuel efficiency, MIKUNI's Large Round Main Jets provide reliable, consistent results. Their robust design ensures they withstand harsh environments, while the precise calibration helps maintain optimal engine operation. Perfect for both daily commuting and extreme off-road adventures, these jets are a must-have for serious powersports enthusiasts.| SKU | GMD6C2A46F |
|---|---|
| MPN | FN100604-155 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Keihin/Mikuni carbureted motorcycles, ATVs | 1980-2025 |
| Honda | XR400R, XR650R, CRF450R | 1990-2010 |
| Yamaha | YZ250F, WR250F | 2000-2020 |
Frequently Asked Questions
Fits Mikuni VM, PF, BS series and many Keihin carbs on Japanese bikes/ATVs. Confirm bore size matches large round style.
Use based on elevation, mods, and plug reads. Typically for mid-high altitude or slightly rich stock setups.
Yes, OEM Mikuni part number FN100604-155.
Single jets for custom tuning; kits provide range like 150-170.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Jet needle holder tool (optional)
Pro Tips
- Remove carburetor float bowl completely. Clean jets and passages with carb cleaner. Test plug chop after install to verify fueling
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet size selection causing lean/rich conditions
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for worn/stock jets
Improvements
- Precise fuel metering for optimal air/fuel ratio
- Better throttle response and power delivery when sized correctly
Considerations
- Requires tuning knowledge; wrong size can damage engine
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning; outlasts carburetor life
Warranty
Manufacturer defect only, typically 1 year
Maintenance
Clean with carb cleaner every service; inspect for wear/clogging
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