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Start ShoppingMIKUNI FM28/1001-42.5 Bleed Pilot Jet - Precision Brass Jet for VM/TM Carburetors
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Description
Upgrade your Mikuni carburetor's fuel delivery system with this precision-machined brass bleed pilot jet. Designed for VM and TM series carburetors, this 42.5mm jet ensures consistent fuel flow and responsive engine performance across a range of riding conditions.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- Exact Dimensions: Clip height 0.315in (8mm) and overall height 0.630in (16mm) for precise carburetor compatibility.
- Bleed-Type Design: Optimizes fuel metering for smooth throttle response and reliable engine operation.
- Lightweight Build: Under 1g weight minimizes impact on engine balance and fuel system efficiency.
- 42.5mm Jet Size: Specifically calibrated for high-performance fuel delivery in Mikuni VM/TM carburetors.
Why Choose This Product
Whether you're tuning a racing engine or upgrading a street bike, this bleed pilot jet delivers unmatched accuracy. Its brass construction resists clogging and maintains consistent flow, while the compact design ensures seamless integration with Mikuni carburetors. The lightweight profile reduces strain on fuel systems, and the precise dimensions guarantee a perfect fit for VM and TM series applications. Riders will appreciate the improved throttle response and stable fuel delivery, making it an essential upgrade for power sports enthusiasts.
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Upgrade your Mikuni carburetor's fuel delivery system with this precision-machined brass bleed pilot jet. Designed for VM and TM series carburetors, this 42.5mm jet ensures consistent fuel flow and responsive engine performance across a range of riding conditions.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- Exact Dimensions: Clip height 0.315in (8mm) and overall height 0.630in (16mm) for precise carburetor compatibility.
- Bleed-Type Design: Optimizes fuel metering for smooth throttle response and reliable engine operation.
- Lightweight Build: Under 1g weight minimizes impact on engine balance and fuel system efficiency.
- 42.5mm Jet Size: Specifically calibrated for high-performance fuel delivery in Mikuni VM/TM carburetors.
Why Choose This Product
Whether you're tuning a racing engine or upgrading a street bike, this bleed pilot jet delivers unmatched accuracy. Its brass construction resists clogging and maintains consistent flow, while the compact design ensures seamless integration with Mikuni carburetors. The lightweight profile reduces strain on fuel systems, and the precise dimensions guarantee a perfect fit for VM and TM series applications. Riders will appreciate the improved throttle response and stable fuel delivery, making it an essential upgrade for power sports enthusiasts.| SKU | GMD286EFF2 |
|---|---|
| MPN | FM28/1001-42.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Models with Mikuni VM26/VM28/VM32/VM34/VM36/VM38/TM series carbs | 1980-2025 |
| Honda | XR250R, XR400R, CRF450R | 1990-2010 |
| Yamaha | YZ125/250, WR250/400/426/450 | 1985-2020 |
Frequently Asked Questions
Mikuni VM & TM series (VM26 to VM38, TM series flat slides). Check your carb markings.
For mid-range tuning, altitude adjustments, or lean condition fixes. Test with idle mixture screw.
Yes, bleed type has a bleed hole for better idle/emission control vs. standard round pilot.
No, Mikuni-specific threading and sizing.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Needle nose pliers
- Jet cleaner tool or compressed air
Pro Tips
- Soak carb in cleaner first
- Use a jet kit gauge to verify size
- Adjust air/fuel screw after install (typically 1.5-2.5 turns out)
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing without removing old jet fully
- Confusing pilot jet with main jet
Comparison vs Stock/OEM
Direct replacement or upgrade for OEM Mikuni jets; bleed design improves idle stability over non-bleed stock pilots
Improvements
- Better throttle response
- Easier tuning at idle/low RPM
- Improved cold starts
Considerations
- Precise sizing required for your setup; not a direct OEM cross for non-Mikuni carbs
Durability & Warranty
Expected Lifespan
Indefinite with proper maintenance (clean every 20-50 hours)
Warranty
Lifetime manufacturer defect warranty (Mikuni)
Maintenance
Ultrasonic clean or carb cleaner soak annually; inspect for clogging
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