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Start ShoppingMIKUNI Large Round Main Jet 112.5 - Precision Fuel Control for High-Performance Engines
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Description
Upgrade your engine's fuel delivery system with the MIKUNI FN100604-112.5 Large Round Main Jet. This critical carburetor component ensures precise fuel flow at mid-to-high throttle positions, delivering consistent power and performance for racing, off-road, and street motorcycles.
Key Features
- Large Round Design: Optimized fuel flow for high-performance engines and aggressive throttle applications.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting reliability in demanding environments.
- 112.5 Size: Precisely calibrated for mid-to-high throttle fuel delivery in Mikuni carburetor systems.
- Direct Replacement: Factory-fit compatibility with Mikuni carburetor models requiring main jet upgrades.
Why Choose This Product
Engineers and riders rely on Mikuni jets for their precision engineering and performance-enhancing capabilities. This main jet delivers consistent fuel metering, reduces hesitation, and improves throttle response. The large round shape minimizes flow restrictions while maintaining accurate fuel-air mixture ratios. Brass's thermal conductivity ensures stable fuel delivery across temperature ranges, making it ideal for racing, trail riding, and high-output engines.
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Upgrade your engine's fuel delivery system with the MIKUNI FN100604-112.5 Large Round Main Jet. This critical carburetor component ensures precise fuel flow at mid-to-high throttle positions, delivering consistent power and performance for racing, off-road, and street motorcycles.
Key Features
- Large Round Design: Optimized fuel flow for high-performance engines and aggressive throttle applications.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting reliability in demanding environments.
- 112.5 Size: Precisely calibrated for mid-to-high throttle fuel delivery in Mikuni carburetor systems.
- Direct Replacement: Factory-fit compatibility with Mikuni carburetor models requiring main jet upgrades.
Why Choose This Product
Engineers and riders rely on Mikuni jets for their precision engineering and performance-enhancing capabilities. This main jet delivers consistent fuel metering, reduces hesitation, and improves throttle response. The large round shape minimizes flow restrictions while maintaining accurate fuel-air mixture ratios. Brass's thermal conductivity ensures stable fuel delivery across temperature ranges, making it ideal for racing, trail riding, and high-output engines.
| SKU | GME9D3FA84 |
|---|---|
| MPN | FN100604-112.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Universal) | Carbureted motorcycles/ATVs with Mikuni VM/PF series carbs | 1980-2025 |
| Yamaha | YFM350X Warrior, Banshee | 1990-2010 |
| Honda | TRX350 FourTrax, XR series | 1985-2005 |
| Suzuki | LT250R Quadzilla, DR-Z400 | 1995-2020 |
Frequently Asked Questions
The main jet controls fuel flow through the carburetor at mid-to-high throttle positions. A larger jet number (like 112.5) allows more fuel flow, while smaller numbers restrict fuel. Proper jetting is critical for engine performance and reliability.
Jet size depends on your specific carburetor model, engine displacement, altitude, fuel type, and desired performance. Consult your carburetor manual, manufacturer specifications, or tuning guides. Start with OEM recommendations and adjust based on plug color and performance.
No. Different Mikuni carburetor models (VM, TM, etc.) use different jet styles and sizes. Verify your carburetor model accepts 'large round' jets before purchasing. Check your carburetor manual or contact Mikuni directly.
Main jets are durable brass components that rarely need replacement unless damaged. Replace them when tuning your carburetor, during major service, or if the jet is cracked or corroded. They typically last the life of the carburetor.
Each jet size number represents a specific orifice diameter. The difference between consecutive sizes (like 110 vs 112.5) is small but affects fuel mixture. Larger numbers = richer mixture (more fuel), smaller numbers = leaner mixture (less fuel).
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- Screwdriver (Phillips or flat head depending on carb)
- Small wrench or socket set
- Carburetor cleaning tools (optional but recommended)
Pro Tips
- Clean carburetor thoroughly before jet replacement
- Keep old jet for reference or backup
- Take photos during disassembly for reassembly reference
- Inspect carburetor gaskets while disassembled - replace if worn
- Test ride and listen for lean/rich conditions after installation
Common Mistakes to Avoid
- Over-tightening jet (can damage brass)
- Installing without cleaning carburetor first
- Not checking jet size compatibility with carburetor model
- Forgetting to drain fuel before disassembly
Durability & Warranty
Expected Lifespan
Indefinite if not damaged - brass jets are very durable
Warranty
Typically covered under manufacturer warranty (usually 1 year)
Maintenance
No maintenance required. Keep clean and dry in storage.
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