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Start ShoppingMikuni FN100604-130 Large Round Main Jet - High-Performance Carburetor Fuel Control
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Description
Upgrade your Mikuni carburetor's fuel delivery system with this precision-engineered main jet. The Large Round design ensures accurate fuel metering for responsive throttle response and consistent power delivery across your engine's operating range.
Key Features
- Large Round Design: Optimized fuel flow geometry for mid-to-high throttle performance tuning
- Brass Construction: Durable, corrosion-resistant material for long-lasting reliability
- 130 Size Specification: Precisely calibrated for fuel delivery matching Mikuni carburetor airflow dynamics
- Direct Replacement: Factory-fit solution for Mikuni carburetors requiring main jet upgrades
Why Choose This Product
Enhance your engine's performance with a main jet engineered for precise fuel metering. This brass component ensures consistent fuel flow at critical throttle positions, improving both power output and fuel efficiency. Its large round shape minimizes flow restrictions while maintaining accurate calibration for smooth acceleration and sustained high-speed performance. Perfect for riders seeking reliable carburetor tuning without compromising engine responsiveness.
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Upgrade your Mikuni carburetor's fuel delivery system with this precision-engineered main jet. The Large Round design ensures accurate fuel metering for responsive throttle response and consistent power delivery across your engine's operating range.
Key Features
- Large Round Design: Optimized fuel flow geometry for mid-to-high throttle performance tuning
- Brass Construction: Durable, corrosion-resistant material for long-lasting reliability
- 130 Size Specification: Precisely calibrated for fuel delivery matching Mikuni carburetor airflow dynamics
- Direct Replacement: Factory-fit solution for Mikuni carburetors requiring main jet upgrades
Why Choose This Product
Enhance your engine's performance with a main jet engineered for precise fuel metering. This brass component ensures consistent fuel flow at critical throttle positions, improving both power output and fuel efficiency. Its large round shape minimizes flow restrictions while maintaining accurate calibration for smooth acceleration and sustained high-speed performance. Perfect for riders seeking reliable carburetor tuning without compromising engine responsiveness.| SKU | GMA432AF8E |
|---|---|
| MPN | FN100604-130 |
| Brand | MIKUNI |
| Category | Jets |
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Frequently Asked Questions
The 130 indicates the jet size/orifice diameter. Larger numbers mean more fuel flow (richer mixture), smaller numbers mean less fuel flow (leaner mixture). Each increment typically represents a small change in fuel delivery.
Signs you need jetting changes include: engine running too rich (black spark plug, poor fuel economy), running too lean (white spark plug, hesitation), or performance changes due to altitude or temperature. Consult your carburetor manual or tuning guide.
Not always. While many Mikuni carburetors use similar jets, fitment depends on the specific carburetor model. Always verify your carburetor type before purchasing.
Usually yes. Most main jets are accessed through the carburetor bowl, which requires removal from the vehicle. Some applications may allow bowl removal without full carburetor removal.
The main jet controls fuel flow at mid-to-high throttle positions, while the pilot jet controls fuel flow at idle and low throttle. Both may need adjustment for proper tuning.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- Small screwdriver or jet removal tool
- Clean workspace
- Carburetor cleaner (optional but recommended)
Pro Tips
- Keep old jet for reference or backup
- Test ride after installation to verify proper jetting
- Larger numbers = richer mixture, smaller numbers = leaner
- Document your jetting changes for future reference
Common Mistakes to Avoid
- Over-tightening jet (can damage brass)
- Installing wrong jet size for your tuning needs
- Not cleaning carburetor before installation
- Forgetting to check fuel mixture after installation
Durability & Warranty
Expected Lifespan
Indefinite if not damaged; jets rarely wear out
Maintenance
No maintenance required; replace only if damaged or for tuning purposes
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