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Start ShoppingMIKUNI F4/042-170 Hex Main Jet - 170 Size Brass Jet for High-Performance Engines
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Description
Upgrade your engine's performance with the MIKUNI F4/042-170 Hex Main Jet, engineered for precise fuel-air mixture control. This 170-size brass jet delivers consistent combustion efficiency, making it essential for riders seeking peak power and responsiveness in racing or off-road applications.
Key Features
- Precision-Crafted Brass Construction: Durable, heat-resistant brass ensures long-lasting performance and resistance to corrosion in demanding environments.
- Standard Hex Dimensions: Universal compatibility with MIKUNI carburetor systems for seamless installation and tuning flexibility.
- Minimal Weight: Lightweight design reduces engine load while maintaining structural integrity for high-speed operation.
- High-Performance Tuning: Fine-tune fuel delivery for enhanced throttle response and power output in modified or stock engines.
Why Choose This Product
Whether you're racing or exploring rugged terrain, this MIKUNI Hex Main Jet offers unmatched reliability and precision. Its brass material ensures consistent flow rates, while the standard hex dimensions simplify replacement and adjustment. Perfect for mechanics and riders who demand peak engine performance without compromising durability.
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Upgrade your engine's performance with the MIKUNI F4/042-170 Hex Main Jet, engineered for precise fuel-air mixture control. This 170-size brass jet delivers consistent combustion efficiency, making it essential for riders seeking peak power and responsiveness in racing or off-road applications.
Key Features
- Precision-Crafted Brass Construction: Durable, heat-resistant brass ensures long-lasting performance and resistance to corrosion in demanding environments.
- Standard Hex Dimensions: Universal compatibility with MIKUNI carburetor systems for seamless installation and tuning flexibility.
- Minimal Weight: Lightweight design reduces engine load while maintaining structural integrity for high-speed operation.
- High-Performance Tuning: Fine-tune fuel delivery for enhanced throttle response and power output in modified or stock engines.
Why Choose This Product
Whether you're racing or exploring rugged terrain, this MIKUNI Hex Main Jet offers unmatched reliability and precision. Its brass material ensures consistent flow rates, while the standard hex dimensions simplify replacement and adjustment. Perfect for mechanics and riders who demand peak engine performance without compromising durability.
| SKU | GM7A42CD54 |
|---|---|
| MPN | F4/042-170 |
| Brand | MIKUNI |
| Category | Jets |
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Frequently Asked Questions
The number indicates the jet size/orifice diameter. Larger numbers = richer fuel mixture. 170 is a common main jet size for small-displacement engines.
Signs of incorrect jetting include: hard starting, poor acceleration, black smoke from exhaust (too rich), or lean running/pinging (too lean). Consult your carburetor manual or engine manufacturer specifications.
No. Different MIKUNI carburetor models use different jet styles and sizes. Verify your carburetor model number matches the F4/042-170 specifications before purchasing.
Yes, the F4/042-170 is an OEM MIKUNI part number. Purchase from authorized distributors to ensure authenticity.
Jets rarely wear out. Replace only if damaged, clogged, or when changing jetting for performance tuning. Cleaning is usually sufficient for maintenance.
Installation Guide
Difficulty
Medium
Est. Time
15 min
Tools Required
- Screwdrivers (Phillips and flat-head)
- Small wrench or socket set
- Carburetor cleaning tools
- Gasket scraper
Pro Tips
- Take photos during disassembly for reference during reassembly
- Clean carburetor thoroughly while jets are removed
- Use new gaskets when reassembling carburetor
- Verify jet seating is flush with carburetor body
- Test run and adjust idle after installation
Common Mistakes to Avoid
- Not draining fuel before carburetor removal
- Losing small O-rings or gaskets during disassembly
- Over-tightening jet, which can damage threads
- Installing jet upside down or in wrong position
Durability & Warranty
Expected Lifespan
Indefinite if not damaged; jets don't typically wear out
Warranty
Manufacturer warranty typically 1 year (varies by retailer)
Maintenance
Clean with carburetor cleaner if clogged; replace if damaged or stripped
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