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Start ShoppingMIKUNI FN100604-162.5 Large Round Main Jets - High-Performance Fuel Flow Control for Powersports Engines
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Description
Ensure peak engine performance with these MIKUNI Large Round Main Jets designed for precise fuel flow regulation. Ideal for powersports engines requiring reliable air-fuel ratio control in demanding conditions.
Key Features
- Precision Engineering: CNC-machined brass construction ensures accurate fuel metering for consistent power delivery.
- Durable Materials: Corrosion-resistant brass withstands high temperatures and fuel exposure for long-lasting performance.
- Perfect Fit: Specifically engineered for MIKUNI carburetor systems to maintain optimal engine efficiency.
- Easy Installation: Standardized design simplifies replacement without compromising fuel system integrity.
Why Choose This Product
Upgrade your fuel delivery system with these high-quality main jets that deliver reliable performance across various riding conditions. The precise fuel flow control enhances engine responsiveness while maintaining emissions compliance. Whether you're tackling off-road trails or street riding, these jets provide the accuracy needed for peak engine performance without unnecessary complexity.
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Ensure peak engine performance with these MIKUNI Large Round Main Jets designed for precise fuel flow regulation. Ideal for powersports engines requiring reliable air-fuel ratio control in demanding conditions.
Key Features
- Precision Engineering: CNC-machined brass construction ensures accurate fuel metering for consistent power delivery.
- Durable Materials: Corrosion-resistant brass withstands high temperatures and fuel exposure for long-lasting performance.
- Perfect Fit: Specifically engineered for MIKUNI carburetor systems to maintain optimal engine efficiency.
- Easy Installation: Standardized design simplifies replacement without compromising fuel system integrity.
Why Choose This Product
Upgrade your fuel delivery system with these high-quality main jets that deliver reliable performance across various riding conditions. The precise fuel flow control enhances engine responsiveness while maintaining emissions compliance. Whether you're tackling off-road trails or street riding, these jets provide the accuracy needed for peak engine performance without unnecessary complexity.| SKU | GM6352DDC4 |
|---|---|
| MPN | FN100604-162.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs with Mikuni VM/PF series carbs | 1980-2025 |
| Suzuki | DR-Z400, RM250/400/450 | 1990-2010 |
| Honda | CRF250R/450R, XR400/650 | 2000-2020 |
| Yamaha | WR250F/450F, YZ250/450 | 1995-2015 |
| Kawasaki | KX250/450, KLX300 | 1985-2005 |
Frequently Asked Questions
The main jet controls fuel flow through the main circuit of the carburetor, primarily affecting fuel mixture at mid to high throttle positions. Larger numbers = richer mixture, smaller numbers = leaner mixture.
Jetting depends on altitude, temperature, air filter, exhaust, and engine modifications. Start with the manufacturer's recommendation for your carburetor model, then adjust based on plug color and performance.
No. Different Mikuni carburetors have different jet configurations. Verify your specific carburetor model accepts large round main jets before purchasing.
Each size increment changes the fuel mixture. Larger numbers (like 162.5) deliver more fuel (richer), smaller numbers deliver less fuel (leaner). Typical increments are 2.5 or 5 sizes.
Yes. Performance modifications like air filters, exhausts, or engine work typically require rejetting to maintain optimal performance and prevent running too rich or lean.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small screwdriver or jet removal tool
- Clean workspace
- Small container for small parts
Pro Tips
- Keep old jet for reference/comparison
- Take photos before disassembly
- Use proper jet removal tool to avoid stripping
- Inspect o-rings and replace if damaged
- Test ride to verify jetting is correct for your conditions
Common Mistakes to Avoid
- Over-tightening jet (can damage brass)
- Not draining fuel before removal
- Losing small o-rings or gaskets
- Installing wrong jet size
Durability & Warranty
Expected Lifespan
Indefinite if not damaged; brass jets don't wear out
Warranty
Typically covered under manufacturer warranty; verify with seller
Maintenance
No maintenance required; inspect for debris or damage before installation
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