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Start ShoppingMIKUNI #165 Large Round Main Jets - High-Performance Brass Jets for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with MIKUNI's #165 Large Round Main Jets. These precision-engineered brass jets deliver consistent fuel flow for enhanced performance, reliability, and throttle response in motorcycles, ATVs, and other off-road vehicles.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh engine environments.
- #165 Jet Size: Precisely calibrated for optimal fuel-air mixture balance in high-output engines.
- 0.25" Diameter Orifice: Large round design minimizes flow restrictions while maintaining precise fuel metering.
- Lightweight Design: Only 0.1 oz (3g) reduces engine load without compromising performance.
Why Choose This Product
MIKUNI jets are trusted by professionals for their accuracy and reliability. The large round style offers superior fuel flow compared to smaller jets, making them ideal for performance tuning, high-RPM applications, and engines requiring precise fuel metering. Their brass construction resists clogging and maintains consistent flow under extreme conditions, ensuring reliable engine operation across diverse terrains and climates.
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Upgrade your powersports engine's fuel delivery system with MIKUNI's #165 Large Round Main Jets. These precision-engineered brass jets deliver consistent fuel flow for enhanced performance, reliability, and throttle response in motorcycles, ATVs, and other off-road vehicles.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh engine environments.
- #165 Jet Size: Precisely calibrated for optimal fuel-air mixture balance in high-output engines.
- 0.25" Diameter Orifice: Large round design minimizes flow restrictions while maintaining precise fuel metering.
- Lightweight Design: Only 0.1 oz (3g) reduces engine load without compromising performance.
Why Choose This Product
MIKUNI jets are trusted by professionals for their accuracy and reliability. The large round style offers superior fuel flow compared to smaller jets, making them ideal for performance tuning, high-RPM applications, and engines requiring precise fuel metering. Their brass construction resists clogging and maintains consistent flow under extreme conditions, ensuring reliable engine operation across diverse terrains and climates.
| SKU | GM01E8E00F |
|---|---|
| MPN | FN100604-165 |
| 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/WR, Kawasaki KX, Suzuki RM) | 1980-2025 |
| Honda | CRF250R, CRF450R | 1990-2010 |
Frequently Asked Questions
Fits Mikuni VM, PF, BS, and HSR series carburetors with large round main jet provision.
Use a jet kit or dyno tune; #165 is common for stock+ mods at sea level.
Yes, OEM Mikuni part number FN100604-165.
No, Keihin uses different jet styles; check your carb model.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench (optional)
Pro Tips
- Remove old jet carefully to avoid damaging needle jet
- Test plug chop after install to verify mixture
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet size selection
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for worn jets
Improvements
- Precise fuel metering
- Consistent flow for better performance
Considerations
- Must match engine mods/altitude for optimal tuning
Durability & Warranty
Expected Lifespan
Indefinite with proper maintenance (replace if corroded/clogged)
Warranty
Mikuni lifetime defect warranty
Maintenance
Inspect during carb cleans; clean with carb cleaner
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