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Start ShoppingMIKUNI #40 Brass Bleed Pilot Jet - High-Performance Fuel System Component
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Description
Upgrade your powersports fuel system with this MIKUNI #40 Brass Bleed Pilot Jet. Designed for precision fuel delivery, this critical component ensures consistent engine performance and reliable operation in demanding riding conditions.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- #40 Size: Precisely calibrated for optimal fuel flow rates in MIKUNI carburetor systems.
- M5 x 0.75 Thread: Standard thread size ensures easy installation and compatibility with most MIKUNI fuel systems.
- Compact Design: 0.25" diameter and 0.5" length for precise fitment in tight engine compartments.
Why Choose This Product
This bleed pilot jet is engineered to maintain proper fuel-air mixture ratios, preventing engine hesitation and ensuring smooth throttle response. Its brass construction resists clogging and wear, while the precise sizing guarantees accurate fuel delivery for maximum power output. Ideal for riders seeking reliable performance in motorcycles, ATVs, and other powersports equipment.
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Upgrade your powersports fuel system with this MIKUNI #40 Brass Bleed Pilot Jet. Designed for precision fuel delivery, this critical component ensures consistent engine performance and reliable operation in demanding riding conditions.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- #40 Size: Precisely calibrated for optimal fuel flow rates in MIKUNI carburetor systems.
- M5 x 0.75 Thread: Standard thread size ensures easy installation and compatibility with most MIKUNI fuel systems.
- Compact Design: 0.25" diameter and 0.5" length for precise fitment in tight engine compartments.
Why Choose This Product
This bleed pilot jet is engineered to maintain proper fuel-air mixture ratios, preventing engine hesitation and ensuring smooth throttle response. Its brass construction resists clogging and wear, while the precise sizing guarantees accurate fuel delivery for maximum power output. Ideal for riders seeking reliable performance in motorcycles, ATVs, and other powersports equipment.
| SKU | GMDA333E2D |
|---|---|
| MPN | FN224103-40 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Keihin/PVM carbureted motorcycles and ATVs | 1985-2024 |
| Suzuki | DR350/DRZ400 | 1990-2005 |
| Honda | XR series (XR250R, XR400R, XR650R) | 1987-2020 |
| Yamaha | XT225, XT350, TTR series | 1990-2010 |
Frequently Asked Questions
Fits Mikuni BS30/BS34/BS36/BS38/BS40/VM series and compatible Keihin carbs on Japanese bikes/ATVs.
Tune based on plug chop test; #40 is common for stock to mildly modified engines at sea level.
Yes, bleed pilot jets have an air bleed hole for better low-speed atomization and easier tuning.
Often yes for mild mods; may need larger size like #42-#45 for big bore or high altitude.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Jet cleaning wire or carb cleaner
- Needle nose pliers
Pro Tips
- Use carb cleaner to flush passages first
- Label jets by size before removal
- Adjust idle mixture screw after install (typically 2-2.5 turns out)
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing without syncing air/fuel mixture
- Dropping tiny jet into carb body
Comparison vs Stock/OEM
Direct replacement/upgrade for OEM Keihin or worn Mikuni pilots
Improvements
- Better fuel atomization at idle/low RPM
- Easier tuning with bleed design
- More consistent metering
Considerations
- Requires re-tuning air/fuel screw
Durability & Warranty
Expected Lifespan
2-5 years or 5,000-10,000 miles typical
Warranty
Limited lifetime from Mikuni against manufacturing defects
Maintenance
Clean with carb cleaner every service; inspect for clogging
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