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Start ShoppingMIKUNI Bleed Pilot Jet 42.5 - Precision Brass Jet for Carburetor Tuning
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Description
Elevate your engine's performance with the MIKUNI FN151067-42.5 Bleed Pilot Jet. This high-quality brass jet delivers precise fuel metering for smoother throttle response, improved efficiency, and consistent power output in Mikuni carburetor systems.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding riding conditions.
- 42.5mm Size: Optimized flow rate for specific engine applications, balancing fuel delivery with airflow for peak performance.
- Mikuni Carburetor Compatibility: Engineered for seamless integration with Mikuni carburetor systems, simplifying tuning and maintenance.
Why Choose This Product
Whether you're fine-tuning a racing engine or optimizing a street bike, this bleed pilot jet offers unmatched precision. Its brass composition resists clogging and maintains consistent fuel flow across temperature ranges. The 42.5mm size ensures proper fuel-air mixture ratios, reducing hesitation and improving throttle control. Perfect for riders seeking reliable, high-performance carburetor solutions without compromising durability.
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Elevate your engine's performance with the MIKUNI FN151067-42.5 Bleed Pilot Jet. This high-quality brass jet delivers precise fuel metering for smoother throttle response, improved efficiency, and consistent power output in Mikuni carburetor systems.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding riding conditions.
- 42.5mm Size: Optimized flow rate for specific engine applications, balancing fuel delivery with airflow for peak performance.
- Mikuni Carburetor Compatibility: Engineered for seamless integration with Mikuni carburetor systems, simplifying tuning and maintenance.
Why Choose This Product
Whether you're fine-tuning a racing engine or optimizing a street bike, this bleed pilot jet offers unmatched precision. Its brass composition resists clogging and maintains consistent fuel flow across temperature ranges. The 42.5mm size ensures proper fuel-air mixture ratios, reducing hesitation and improving throttle control. Perfect for riders seeking reliable, high-performance carburetor solutions without compromising durability.| SKU | GMF01ECD35 |
|---|---|
| MPN | FN151067-42.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Keihin/Mikuni carbureted motorcycles, ATVs | 1985-2024 |
| Honda | CRF450R, XR400R | 2000-2015 |
| Yamaha | YZ250F, WR250F | 1998-2020 |
Frequently Asked Questions
A bleed pilot jet is a small orifice in the carburetor's pilot circuit that meters fuel at idle and low-speed operation. It affects idle quality, throttle response, and low-end performance. The 42.5 size indicates the jet's orifice diameter in millimeters.
Signs include rough idle, poor throttle response at low RPM, difficulty starting, or lean/rich running conditions at idle. Jetting changes may be needed when modifying air intake, exhaust, or riding at different altitudes.
Typically no. Most pilot jets require carburetor removal and disassembly to access. Some carburetors have external pilot adjusters, but complete jet replacement usually requires full disassembly.
Pilot jets control fuel delivery at idle and low throttle openings (0-25% throttle). Main jets control fuel delivery at higher throttle positions. Both work together for proper carburetor tuning across the entire throttle range.
This is a tuning jet. Compatibility depends on your carburetor model and current jetting setup. Consult your carburetor manual or tuning guide to determine if 42.5 is the correct size for your application.
Installation Guide
Difficulty
Medium
Est. Time
15 min
Tools Required
- Small screwdrivers (Phillips and flat-head)
- Carburetor cleaning tools
- Gasket scraper
- Carburetor rebuild kit (recommended)
Pro Tips
- Clean all carburetor passages thoroughly before installation
- Use new gaskets when reassembling carburetor
- Test run and adjust idle mixture screw after installation
- Keep detailed notes of original jetting for reference
- Consider replacing all jets as a set for consistent tuning
Common Mistakes to Avoid
- Installing jet without cleaning carburetor passages first
- Over-tightening jet (can damage brass)
- Not replacing gaskets during reassembly
- Incorrect jet sizing for application
Durability & Warranty
Expected Lifespan
Indefinite if properly maintained; brass jets don't wear out but can become clogged
Warranty
Typically no warranty on tuning jets; check with specific retailer
Maintenance
Clean carburetor passages regularly to prevent jet clogging; inspect for debris during carburetor service
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