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Start ShoppingMIKUNI Large Round Main Jets - High-Performance Fuel Jet for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with MIKUNI's Large Round Main Jets. These precision-engineered jets ensure optimal air-fuel mixture for enhanced power, efficiency, and reliable performance in motorcycles, ATVs, and UTVs.
Key Features
- High-Flow Design: Optimized fuel metering for maximum engine output and responsiveness.
- Durable Construction: Precision-machined brass for long-lasting performance in harsh riding conditions.
- Universal Compatibility: Designed to fit standard MIKUNI carburetor systems for easy installation.
- Adjustable Flow: Fine-tune fuel delivery for specific engine tuning needs.
- Seamless Integration: Ensures smooth fuel flow without clogging or restriction.
Why Choose This Product
These MIKUNI jets deliver consistent fuel delivery for improved throttle response, better fuel efficiency, and reduced emissions. The robust brass construction resists corrosion and wear, while the adjustable flow settings allow customization for different riding conditions. Whether you're modifying a motorcycle or optimizing an ATV, these jets provide reliable performance that meets the demands of serious riders.
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Upgrade your powersports engine's fuel delivery system with MIKUNI's Large Round Main Jets. These precision-engineered jets ensure optimal air-fuel mixture for enhanced power, efficiency, and reliable performance in motorcycles, ATVs, and UTVs.
Key Features
- High-Flow Design: Optimized fuel metering for maximum engine output and responsiveness.
- Durable Construction: Precision-machined brass for long-lasting performance in harsh riding conditions.
- Universal Compatibility: Designed to fit standard MIKUNI carburetor systems for easy installation.
- Adjustable Flow: Fine-tune fuel delivery for specific engine tuning needs.
- Seamless Integration: Ensures smooth fuel flow without clogging or restriction.
Why Choose This Product
These MIKUNI jets deliver consistent fuel delivery for improved throttle response, better fuel efficiency, and reduced emissions. The robust brass construction resists corrosion and wear, while the adjustable flow settings allow customization for different riding conditions. Whether you're modifying a motorcycle or optimizing an ATV, these jets provide reliable performance that meets the demands of serious riders.
| SKU | GMF5398487 |
|---|---|
| MPN | FN100604-60 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (e.g., Honda XR series, Yamaha YZ, Kawasaki KX, Suzuki RM) | 1980-2025 |
| Honda | CRF250R, CRF450R | 1990-2010 |
| Yamaha | WR250F, YZ250F | 2000-2020 |
Frequently Asked Questions
Fits Mikuni large round main jet applications including VM26-VM44, BS32-42, TM40, HSR42/45 carburetors on most Japanese bikes.
Use a plug chop test or wideband O2 sensor; #60 is common for stock to mildly modified engines at sea level.
No, Mikuni large round jets have different flow rates; use Mikuni jet chart for equivalents (e.g., ~#168 Keihin PWK).
No, this is for carbureted engines only.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet needle holder (optional)
Pro Tips
- Remove float bowl completely for access; mark original jet size; test plug chop after install to verify fueling
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet sizing without tuning
Comparison vs Stock/OEM
Direct replacement or upgrade for OEM Mikuni jets; same precision machining
Improvements
- Consistent flow calibration
- Pure brass for corrosion resistance
Considerations
- Aftermarket but OEM-equivalent quality from Mikuni
Durability & Warranty
Expected Lifespan
Indefinite with proper maintenance (does not wear out)
Warranty
Limited lifetime (manufacturer defect only)
Maintenance
Inspect for debris during carb cleaning; replace if damaged
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