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Start ShoppingMIKUNI F4/042-80 Hex Main Jet - 80 Size Brass Carburetor Jet for Mikuni Carburetors
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Description
Upgrade your Mikuni carburetor's fuel delivery system with this high-quality hex main jet. Engineered for precision tuning, this 80-size brass jet ensures optimal air-fuel ratios for enhanced power and efficiency across a range of powersports applications.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding environments.
- Hex Main Jet Design: Standard Mikuni hex thread compatibility simplifies installation and adjustment for precise fuel flow control.
- 80 Size Specification: Perfectly calibrated for Mikuni carburetors requiring main jet size 80 for balanced engine operation.
- Universal Compatibility: Designed for Mikuni carburetors with hex jet ports, ensuring seamless integration with existing systems.
Why Choose This Product
Whether you're fine-tuning a dirt bike, ATV, or off-road motorcycle, this hex main jet delivers reliable performance with its precision-engineered brass construction. The standard thread design ensures easy installation and adjustment, while the 80-size specification provides optimal fuel flow for responsive throttle response and consistent power delivery. Riders will appreciate the durability and accuracy of this Mikuni-approved component, which helps maintain peak engine performance under various operating conditions.
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Upgrade your Mikuni carburetor's fuel delivery system with this high-quality hex main jet. Engineered for precision tuning, this 80-size brass jet ensures optimal air-fuel ratios for enhanced power and efficiency across a range of powersports applications.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding environments.
- Hex Main Jet Design: Standard Mikuni hex thread compatibility simplifies installation and adjustment for precise fuel flow control.
- 80 Size Specification: Perfectly calibrated for Mikuni carburetors requiring main jet size 80 for balanced engine operation.
- Universal Compatibility: Designed for Mikuni carburetors with hex jet ports, ensuring seamless integration with existing systems.
Why Choose This Product
Whether you're fine-tuning a dirt bike, ATV, or off-road motorcycle, this hex main jet delivers reliable performance with its precision-engineered brass construction. The standard thread design ensures easy installation and adjustment, while the 80-size specification provides optimal fuel flow for responsive throttle response and consistent power delivery. Riders will appreciate the durability and accuracy of this Mikuni-approved component, which helps maintain peak engine performance under various operating conditions.| SKU | GM92F997CB |
|---|---|
| MPN | F4/042-80 |
| Brand | MIKUNI |
| Category | Jets |
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Frequently Asked Questions
The '80' indicates the jet size/orifice diameter. Larger numbers = richer fuel mixture. Jet sizing is critical for proper carburetor tuning.
Check your carburetor model documentation or inspect the main jet - if it has a hexagonal head, it uses hex jets. Mikuni carburetors vary in jet type.
No. Verify your specific carburetor model accepts F4 series hex jets. Different Mikuni models use different jet types and sizes.
Incorrect jetting causes poor performance: too small = lean condition (overheating, poor acceleration); too large = rich condition (fouled plugs, poor fuel economy).
Possibly. Changes to intake, exhaust, or air filter may require jetting adjustments for optimal performance. Consult tuning guides for your specific setup.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Hex wrench or socket (appropriate size for hex jet)
- Small flathead screwdriver (for carburetor access if needed)
- Gasket scraper (optional, for cleaning)
Pro Tips
- Keep the carburetor clean before jet installation
- Tighten gently - these are precision components
- Test run after installation to verify proper jetting
- Keep spare jets on hand for tuning adjustments
- Document your jetting changes for future reference
Common Mistakes to Avoid
- Over-tightening the jet, which can strip threads or crack the carburetor body
- Installing wrong jet size without proper tuning
- Not cleaning the jet passage before installation
- Failing to verify carburetor compatibility before purchase
Durability & Warranty
Expected Lifespan
Indefinite if properly maintained
Warranty
Typically covered under manufacturer warranty if defective
Maintenance
No maintenance required - jets are passive components. Replace only when changing jetting specifications.
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