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Start ShoppingMIKUNI FN100604-140 Large Round Main Jet - High-Performance Carburetor Fuel Jet
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Description
Upgrade your Mikuni carburetor's fuel delivery system with this premium large round main jet. Engineered for precision performance, this 140-size jet ensures consistent fuel flow across mid-to-high throttle ranges, delivering reliable power and efficiency for riders who demand peak engine operation.
Key Features
- Brand-Original Design: Precision-machined to exact Mikuni specifications for seamless compatibility with factory carburetor systems.
- 140-Size Jet: Optimized for mid-to-high throttle fuel delivery, balancing power output with fuel efficiency.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding riding conditions.
- Standard Taper Thread: Easy installation with universal compatibility for Mikuni carburetor setups.
- Large Round Profile: Standard Mikuni round jet design for consistent fuel flow and reduced clogging risks.
Why Choose This Product
Whether you're tuning a high-performance motorcycle or maintaining a reliable off-road rig, this Mikuni main jet delivers unmatched precision. Its brass construction resists wear from fuel and heat, while the 140-size jet ensures optimal fuel metering for power and efficiency. The standard taper thread simplifies installation, making it a must-have for mechanics and riders seeking reliable carburetor performance. Perfect for both stock and modified engines, this jet maintains factory calibration while supporting enhanced throttle response and fuel economy.
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Upgrade your Mikuni carburetor's fuel delivery system with this premium large round main jet. Engineered for precision performance, this 140-size jet ensures consistent fuel flow across mid-to-high throttle ranges, delivering reliable power and efficiency for riders who demand peak engine operation.
Key Features
- Brand-Original Design: Precision-machined to exact Mikuni specifications for seamless compatibility with factory carburetor systems.
- 140-Size Jet: Optimized for mid-to-high throttle fuel delivery, balancing power output with fuel efficiency.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding riding conditions.
- Standard Taper Thread: Easy installation with universal compatibility for Mikuni carburetor setups.
- Large Round Profile: Standard Mikuni round jet design for consistent fuel flow and reduced clogging risks.
Why Choose This Product
Whether you're tuning a high-performance motorcycle or maintaining a reliable off-road rig, this Mikuni main jet delivers unmatched precision. Its brass construction resists wear from fuel and heat, while the 140-size jet ensures optimal fuel metering for power and efficiency. The standard taper thread simplifies installation, making it a must-have for mechanics and riders seeking reliable carburetor performance. Perfect for both stock and modified engines, this jet maintains factory calibration while supporting enhanced throttle response and fuel economy.| SKU | GMF1AB8992 |
|---|---|
| MPN | FN100604-140 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (Keihin/Mikuni carbs) | 1980-2025 |
| Yamaha | XT600, YZ series | 1990-2010 |
| Suzuki | DR series, RM series | 1985-2005 |
Frequently Asked Questions
The main jet controls fuel delivery at mid-to-high throttle positions. It's one of the primary tuning components for carburetor performance.
Jet sizing depends on altitude, temperature, engine modifications, and air filter type. Start with the manufacturer's recommendation and adjust based on plug color and performance.
Large round jets are standard Mikuni configuration. Other styles (needle jets, pilot jets) control different throttle ranges. Each serves a specific purpose in fuel delivery.
No - verify your carburetor model accepts large round jets. Some Mikuni models use different jet configurations. Check your carb documentation.
Jets rarely need replacement unless damaged or clogged. They typically last the life of the carburetor. Replace only if performance issues arise or during major carburetor service.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- Carburetor removal tools (varies by application)
- Small screwdriver or jet removal tool
- Clean workspace
- Carburetor cleaner
Pro Tips
- Take photos during disassembly for reference
- Clean carburetor thoroughly while apart
- Test ride and adjust if needed - jetting affects performance
- Keep old jet for reference or backup
- Ensure carburetor is completely dry before reassembly
Common Mistakes to Avoid
- Over-tightening jet (can damage brass)
- Installing jet upside down
- Not cleaning carburetor before reassembly
- Forgetting to drain fuel before disassembly
Durability & Warranty
Expected Lifespan
Indefinite if not damaged - brass jets don't wear out
Warranty
Typically covered under Mikuni's standard warranty
Maintenance
No maintenance required - replace only if damaged or clogged
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