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Start ShoppingMikuni FN100604-115 Large Round Main Jet - Precision Fuel Metering for High-Performance Engines
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Description
Upgrade your carburetor's fuel delivery system with Mikuni's precision-engineered FN100604-115 Large Round Main Jet. This 115-size brass jet delivers consistent fuel metering for responsive throttle control and peak engine performance in high-output applications.
Key Features
- Part Number: FN100604-115 - Direct replacement for original equipment Mikuni jets
- Jet Size: 115 - Optimized for high-flow fuel delivery in performance engines
- Material: Durable brass construction resists corrosion and ensures long-lasting reliability
- Shape: Large round design provides smooth fuel flow characteristics
- Engineering: Precision-machined for accurate fuel metering and consistent performance
Why Choose This Product
Upgrade your engine's fuel delivery system with Mikuni's trusted main jet solution. The FN100604-115's brass construction ensures consistent fuel flow under varying conditions, while its 115-size specification is ideal for high-performance carbureted engines. This large round jet delivers precise fuel metering for improved throttle response, enhanced power delivery, and reliable operation in demanding environments. Perfect for motorcycle, ATV, and UTV applications requiring precise fuel control.
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Upgrade your carburetor's fuel delivery system with Mikuni's precision-engineered FN100604-115 Large Round Main Jet. This 115-size brass jet delivers consistent fuel metering for responsive throttle control and peak engine performance in high-output applications.
Key Features
- Part Number: FN100604-115 - Direct replacement for original equipment Mikuni jets
- Jet Size: 115 - Optimized for high-flow fuel delivery in performance engines
- Material: Durable brass construction resists corrosion and ensures long-lasting reliability
- Shape: Large round design provides smooth fuel flow characteristics
- Engineering: Precision-machined for accurate fuel metering and consistent performance
Why Choose This Product
Upgrade your engine's fuel delivery system with Mikuni's trusted main jet solution. The FN100604-115's brass construction ensures consistent fuel flow under varying conditions, while its 115-size specification is ideal for high-performance carbureted engines. This large round jet delivers precise fuel metering for improved throttle response, enhanced power delivery, and reliable operation in demanding environments. Perfect for motorcycle, ATV, and UTV applications requiring precise fuel control.
| SKU | GM0A03D249 |
|---|---|
| MPN | FN100604-115 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Keihin/Mikuni carbureted motorcycles, ATVs | 1980-2025 |
| Yamaha | YFM350X Warrior, Banshee | 1990-2010 |
| Honda | TRX350 FourTrax | 1985-2005 |
Frequently Asked Questions
The main jet controls fuel flow at mid-range to full throttle engine operation. It's critical for proper engine performance and fuel economy.
Jet sizing depends on altitude, temperature, engine modifications, and air filter type. Start with manufacturer recommendations and adjust based on plug color and performance.
Yes, but it requires carburetor removal and basic mechanical skills. You'll need to access the carburetor bowl and clean it thoroughly.
Larger numbers (like 115) mean larger orifices, allowing more fuel flow. Use larger jets for high altitude, cold weather, or modified engines; smaller jets for low altitude or lean conditions.
Possibly. Aftermarket air filters often flow more air, requiring a larger main jet to maintain proper fuel-air ratio.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- Carburetor removal tools
- Small screwdrivers
- Carburetor cleaning supplies
- Gasket scraper
- New gaskets/seals
Pro Tips
- Clean entire carburetor while jets are removed
- Keep jets organized by size to avoid confusion
- Gently seat jets - they should fit snugly without force
- Test ride and adjust other jets if needed for optimal performance
- Document original jet sizes before removal
Common Mistakes to Avoid
- Not cleaning carburetor thoroughly before installation
- Forcing jet into seat (can damage needle seat)
- Mixing up jet sizes during installation
- Not replacing gaskets when reassembling
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