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Start ShoppingMIKUNI Hex Main Jets #490 - High-Performance Brass Fuel Jets for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with MIKUNI's premium hex main jets. These precision-engineered brass jets deliver optimal airflow and fuel mixture for enhanced power, responsiveness, and reliability in motorcycles, ATVs, and more.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh riding conditions.
- #490 Jet Size: Specifically calibrated for high-performance fuel systems requiring precise air-fuel ratio control.
- Hex Head Thread: 4mm orifice design provides secure, leak-proof installation for consistent fuel flow.
- M5 x 0.75 Thread: Standardized threading ensures compatibility with most MIKUNI carburetor models.
Why Choose This Product
Whether you're tuning a racing bike or optimizing your off-road rig, these jets offer unmatched precision and durability. The brass alloy resists clogging and wear, while the hex thread design simplifies installation and adjustment. Perfect for riders seeking to fine-tune engine performance without compromising reliability. Ideal for both professional mechanics and DIY enthusiasts looking to maximize power output and fuel efficiency.
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Upgrade your powersports engine's fuel delivery system with MIKUNI's premium hex main jets. These precision-engineered brass jets deliver optimal airflow and fuel mixture for enhanced power, responsiveness, and reliability in motorcycles, ATVs, and more.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh riding conditions.
- #490 Jet Size: Specifically calibrated for high-performance fuel systems requiring precise air-fuel ratio control.
- Hex Head Thread: 4mm orifice design provides secure, leak-proof installation for consistent fuel flow.
- M5 x 0.75 Thread: Standardized threading ensures compatibility with most MIKUNI carburetor models.
Why Choose This Product
Whether you're tuning a racing bike or optimizing your off-road rig, these jets offer unmatched precision and durability. The brass alloy resists clogging and wear, while the hex thread design simplifies installation and adjustment. Perfect for riders seeking to fine-tune engine performance without compromising reliability. Ideal for both professional mechanics and DIY enthusiasts looking to maximize power output and fuel efficiency.| SKU | GM22EE60F7 |
|---|---|
| MPN | F4/042-490 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Suzuki, Yamaha, Kawasaki, Honda) | Carbureted motorcycles/ATVs | 1980-2025 |
Frequently Asked Questions
Fits Mikuni VM series (VM26-VM44), PF, BS30/BS34, HSR42/45; not stock Keihin carbs.
Consult Mikuni jetting chart for your engine size, altitude, mods; start with OEM size and adjust.
Hex head allows easier installation/removal without special tools; same flow as round.
No, for carbureted models only.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench or needle nose pliers
Pro Tips
- Remove carb float bowl first; note original jet size; use carb cleaner on threads
Common Mistakes to Avoid
- Dropping jet into carb body
- Not cleaning needle jet first
Comparison vs Stock/OEM
Direct replacement for OEM Mikuni jets; hex head improves serviceability over round OEM
Improvements
- Easier to install/remove
- Precision machined for consistent fuel flow
Considerations
- None; identical performance to OEM
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning; resistant to fuel corrosion
Warranty
Limited lifetime (manufacturer defect only)
Maintenance
Clean with carb cleaner every service; inspect for debris
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