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Start ShoppingMIKUNI FM28/1001-20 Bleed Pilot Jets - Brass Air/Fuel Mixture Tuning for Powersports Engines
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Description
Elevate your powersports engine's performance with MIKUNI's precision-engineered bleed pilot jets. These critical components offer precise air/fuel mixture control, ensuring peak power delivery and fuel efficiency for motorcycles, ATVs, and more.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh engine environments
- M5 x 0.75 Thread: Standard thread size ensures compatibility with most Mikuni carburetor systems
- 0.5" Overall Length: Compact design fits standard carburetor configurations without modification
- #100 Main Jet Equivalence: Direct replacement for precise fuel metering in high-performance applications
- Bleed Circuit Design: Fine-tune air/fuel mixture for optimal throttle response and power delivery
Why Choose This Product
MIKUNI bleed pilot jets deliver unmatched accuracy for carburetor tuning. The brass construction resists wear and maintains consistent flow rates under extreme conditions. The M5 x 0.75 thread size ensures easy installation and compatibility with most Mikuni carburetor models. With a 0.5" length, these jets fit standard mounting positions without requiring carburetor modifications. The #100 main jet equivalence makes them an ideal choice for riders seeking precise fuel metering. Whether you're optimizing performance for racing or improving fuel efficiency for daily use, these jets provide the precision needed to achieve your goals. Their lightweight design (0.1 oz) allows for rapid response to throttle changes, while the bleed circuit system enables fine-tuning of the air/fuel mixture for perfect engine balance.
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Elevate your powersports engine's performance with MIKUNI's precision-engineered bleed pilot jets. These critical components offer precise air/fuel mixture control, ensuring peak power delivery and fuel efficiency for motorcycles, ATVs, and more.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh engine environments
- M5 x 0.75 Thread: Standard thread size ensures compatibility with most Mikuni carburetor systems
- 0.5" Overall Length: Compact design fits standard carburetor configurations without modification
- #100 Main Jet Equivalence: Direct replacement for precise fuel metering in high-performance applications
- Bleed Circuit Design: Fine-tune air/fuel mixture for optimal throttle response and power delivery
Why Choose This Product
MIKUNI bleed pilot jets deliver unmatched accuracy for carburetor tuning. The brass construction resists wear and maintains consistent flow rates under extreme conditions. The M5 x 0.75 thread size ensures easy installation and compatibility with most Mikuni carburetor models. With a 0.5" length, these jets fit standard mounting positions without requiring carburetor modifications. The #100 main jet equivalence makes them an ideal choice for riders seeking precise fuel metering. Whether you're optimizing performance for racing or improving fuel efficiency for daily use, these jets provide the precision needed to achieve your goals. Their lightweight design (0.1 oz) allows for rapid response to throttle changes, while the bleed circuit system enables fine-tuning of the air/fuel mixture for perfect engine balance.| SKU | GM11C0A4B7 |
|---|---|
| MPN | FM28/1001-20 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Mikuni carbureted) | VM, VM/P, BS, HSR series carbs on dirt bikes, ATVs, street bikes | 1980-2025 |
| Yamaha | PW80, YZ125, WR250 | 1990-2010 |
| Honda | XR series, CRF250R | 1985-2005 |
Frequently Asked Questions
Fits Mikuni VM26-VM34, BS32-36, HSR42/45 series with bleed pilot circuit. Check your carb model markings.
This is a bleed pilot jet, used in the low-speed circuit for idle and off-idle tuning, equivalent to #100 size bleed.
Not always; this is for pilot circuit only. Test ride and monitor plug color. Often paired with main jet changes for full tuning.
Larger bleed hole (vs stock) typically richens the pilot circuit by allowing more air, reducing fuel flow at idle.
No, Mikuni-specific threading and design. Keihin uses different pilot jets.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Jet cleaning needle or wire
- Carb cleaner
Pro Tips
- Remove carb from bike if possible for better access. Clean all passages with compressed air. Test at idle and 1/4 throttle after install. Mark your stock jet size for reference.
Common Mistakes to Avoid
- Not cleaning jet passages before install
- Over-tightening jet (strip threads)
- Forgetting to adjust air screw after swap
Comparison vs Stock/OEM
Aftermarket precision-machined brass vs OEM stamped; consistent orifice size
Improvements
- Better flow consistency
- Ideal for tuning mods like exhaust/airbox
- Corrosion resistant
Considerations
- Requires tuning knowledge; not plug-and-play without testing
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning (carb lasts 5-10 years with maintenance)
Warranty
Limited lifetime from Mikuni against defects
Maintenance
Clean with carb cleaner every 20-50 hours; inspect for clogging
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