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Start ShoppingMikuni FN100604-132.5 Large Round Main Jets - Precision Fuel Metering for Carburetors
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Description
Elevate your engine's performance with Mikuni's Large Round Main Jets, engineered for precise fuel metering and reliable operation. These critical components ensure optimal air-fuel ratios, enhancing power delivery and fuel efficiency across a range of powersports applications.
Key Features
- Precision Fuel Metering: Advanced design ensures accurate fuel flow for consistent engine performance.
- Universal Compatibility: Fits most Mikuni carburetor models for easy installation and replacement.
- Durable Brass Construction: Corrosion-resistant material withstands harsh environments and prolonged use.
- Easy Installation: Streamlined design simplifies maintenance and tuning processes.
Why Choose This Product
Whether you're tuning a high-performance motorcycle or optimizing a utility vehicle, these main jets deliver reliable fuel delivery. Their precision engineering helps prevent engine knocking and ensures smooth throttle response. The durable brass construction resists clogging and wear, while the universal fitment saves time and effort during maintenance. Upgrade to Mikuni's trusted components for a noticeable improvement in engine efficiency and power output.
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Elevate your engine's performance with Mikuni's Large Round Main Jets, engineered for precise fuel metering and reliable operation. These critical components ensure optimal air-fuel ratios, enhancing power delivery and fuel efficiency across a range of powersports applications.
Key Features
- Precision Fuel Metering: Advanced design ensures accurate fuel flow for consistent engine performance.
- Universal Compatibility: Fits most Mikuni carburetor models for easy installation and replacement.
- Durable Brass Construction: Corrosion-resistant material withstands harsh environments and prolonged use.
- Easy Installation: Streamlined design simplifies maintenance and tuning processes.
Why Choose This Product
Whether you're tuning a high-performance motorcycle or optimizing a utility vehicle, these main jets deliver reliable fuel delivery. Their precision engineering helps prevent engine knocking and ensures smooth throttle response. The durable brass construction resists clogging and wear, while the universal fitment saves time and effort during maintenance. Upgrade to Mikuni's trusted components for a noticeable improvement in engine efficiency and power output.
| SKU | GM49314DF2 |
|---|---|
| MPN | FN100604-132.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Honda, Yamaha, Kawasaki, Suzuki) | Carbureted motorcycles/ATVs with Mikuni VM or TM series carbs | 1980-2025 |
| Honda | XR series (XR250R, XR400R, XR650R) | 1990-2010 |
| Yamaha | XT series (XT250, XT350) | 1985-2005 |
| Kawasaki | KX250/450 (pre-fuel injection) | 1995-2020 |
Frequently Asked Questions
The main jet controls fuel flow through the main fuel circuit, which operates at mid-range to full throttle. It's the primary jet affecting performance at higher RPMs and load conditions.
Jet sizing depends on altitude, temperature, engine modifications, and carburetor tuning. Start with the OEM specification and adjust based on plug color readings and performance. Larger numbers = richer mixture.
Jet sizes are measured in specific increments. 132.5 is a mid-range size. Smaller numbers (like 120) create leaner mixtures; larger numbers (like 145) create richer mixtures.
No. Different Mikuni carburetors have different jet specifications. Verify your carburetor model (e.g., VM26, TM40, etc.) before purchasing.
Main jets rarely wear out. Replace only when tuning for different conditions or if damaged. They can last the life of the carburetor with proper maintenance.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- Screwdriver (Phillips or flat, depending on carburetor)
- Small wrench or socket set
- Gasket scraper (plastic preferred)
Pro Tips
- Take photos during disassembly for reference
- Replace carburetor gaskets while apart
- Clean carburetor thoroughly while disassembled
- Test run engine and check for proper idle and throttle response
Common Mistakes to Avoid
- Over-tightening jet (can damage brass)
- Not replacing gasket when reassembling
- Failing to drain fuel completely before disassembly
- Installing jet upside down (though difficult to do)
Durability & Warranty
Expected Lifespan
Indefinite under normal use; brass does not wear significantly
Warranty
Typically covered under Mikuni's standard parts warranty
Maintenance
No maintenance required; inspect for debris if carburetor is serviced
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