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Start ShoppingMIKUNI Hex Main Jets #440 - Precision Brass Fuel Jet for High-Performance Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with these precision-engineered MIKUNI Hex Main Jets. Designed for high-performance motorcycles and ATVs, these brass jets deliver consistent fuel metering for optimal power and efficiency.
Key Features
- Brass Construction: Corrosion-resistant material ensures long-lasting durability in harsh riding conditions.
- #440 Jet Size: Precisely calibrated for balanced fuel-air mixture in high-output engines.
- Hex Thread Design: 5/16-32 thread pattern ensures secure installation and easy adjustments.
- Compact Dimensions: 0.5" length and 0.375" hex width fit standard carburetor housings.
- Lightweight Build: Under 1 gram for minimal impact on engine performance.
Why Choose This Product
These MIKUNI jets offer unmatched precision for fuel tuning, helping riders achieve smoother throttle response and improved fuel efficiency. The brass material resists clogging and maintains consistent flow rates, while the hex design simplifies maintenance. Perfect for racers and enthusiasts seeking reliable performance in demanding environments.
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Upgrade your powersports engine's fuel delivery system with these precision-engineered MIKUNI Hex Main Jets. Designed for high-performance motorcycles and ATVs, these brass jets deliver consistent fuel metering for optimal power and efficiency.
Key Features
- Brass Construction: Corrosion-resistant material ensures long-lasting durability in harsh riding conditions.
- #440 Jet Size: Precisely calibrated for balanced fuel-air mixture in high-output engines.
- Hex Thread Design: 5/16-32 thread pattern ensures secure installation and easy adjustments.
- Compact Dimensions: 0.5" length and 0.375" hex width fit standard carburetor housings.
- Lightweight Build: Under 1 gram for minimal impact on engine performance.
Why Choose This Product
These MIKUNI jets offer unmatched precision for fuel tuning, helping riders achieve smoother throttle response and improved fuel efficiency. The brass material resists clogging and maintains consistent flow rates, while the hex design simplifies maintenance. Perfect for racers and enthusiasts seeking reliable performance in demanding environments.
| SKU | GM55AFA6D4 |
|---|---|
| MPN | F4/042-440 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Universal) | Carbureted motorcycles, ATVs | 1980-2025 |
Frequently Asked Questions
Fits most Mikuni round-slide carbs like VM26-VM44, TM series, HSR42/45; not for square-slide PDS carbs.
Check stock jet or use jet kit calculator based on altitude, mods, and main jet range.
Hex jets have external hex head for easier removal without special tools.
No, Mikuni jets are not interchangeable with Keihin; check your carb markings.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench or hex key
Pro Tips
- Remove float bowl, note stock jet size, clean o-ring groove, use carb cleaner
Common Mistakes to Avoid
- Installing wrong jet size
- Not cleaning carb passages before install
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for worn jets
Improvements
- Precise fuel metering for better performance
- Easier installation than round jets
Considerations
- Precise sizing critical for tuning
Durability & Warranty
Expected Lifespan
Indefinite with proper tuning (brass construction)
Warranty
Limited manufacturer warranty against defects
Maintenance
Inspect during carb cleaning; replace if eroded or clogged
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