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Start ShoppingMIKUNI Large Round Main Jet 52.5 - High-Performance Brass Jet for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with the MIKUNI FN100604-52.5 Large Round Main Jet. This high-precision brass jet delivers consistent fuel flow for improved performance, responsiveness, and engine efficiency in motorcycles, ATVs, and more.
Key Features
- 52.5 Orifice Size: Precisely calibrated for optimal fuel-air mixture in high-performance engines.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting reliability in demanding environments.
- Clip-On Design: Easy installation and adjustment for quick carburetor maintenance and tuning.
- 0.130 Inch Orifice: Fine-tuned flow rate for balanced power delivery and fuel efficiency.
- Lightweight (0.5g): Minimal impact on engine performance while maintaining structural integrity.
Why Choose This Product
Whether you're racing or riding recreationally, this MIKUNI main jet ensures precise fuel metering for smoother throttle response, better fuel economy, and reduced engine wear. Its clip-on style simplifies replacement during maintenance, while the brass material resists clogging and maintains accuracy over time. Perfect for carbureted engines requiring fine-tuned fuel delivery optimization.
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Upgrade your powersports engine's fuel delivery system with the MIKUNI FN100604-52.5 Large Round Main Jet. This high-precision brass jet delivers consistent fuel flow for improved performance, responsiveness, and engine efficiency in motorcycles, ATVs, and more.
Key Features
- 52.5 Orifice Size: Precisely calibrated for optimal fuel-air mixture in high-performance engines.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting reliability in demanding environments.
- Clip-On Design: Easy installation and adjustment for quick carburetor maintenance and tuning.
- 0.130 Inch Orifice: Fine-tuned flow rate for balanced power delivery and fuel efficiency.
- Lightweight (0.5g): Minimal impact on engine performance while maintaining structural integrity.
Why Choose This Product
Whether you're racing or riding recreationally, this MIKUNI main jet ensures precise fuel metering for smoother throttle response, better fuel economy, and reduced engine wear. Its clip-on style simplifies replacement during maintenance, while the brass material resists clogging and maintains accuracy over time. Perfect for carbureted engines requiring fine-tuned fuel delivery optimization.| SKU | GM3BD51F58 |
|---|---|
| MPN | FN100604-52.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (Keihin/Mikuni carbs) | 1980-2025 |
| Yamaha | YFM350X Warrior, YZ series | 1990-2010 |
| Honda | TRX series ATVs, XR series | 1985-2020 |
| Suzuki | LT series ATVs, RM series | 1995-2015 |
Frequently Asked Questions
Fits Mikuni VM series (VM24-VM34), BS series, and compatible Keihin carbs with large round main jet slot.
Use plug chop method or wideband O2 sensor; typically for mid-range tuning at sea level or slight lean conditions.
Yes, OEM Mikuni part number FN100604-52.5.
Yes, direct replacement for worn or mismatched jets.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet needle holder (optional)
Pro Tips
- Remove float bowl, unscrew old jet with screwdriver. Test plug chop after install to verify mixture
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect jet sizing without testing
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for precise fuel flow calibration
Improvements
- Exact sizing for optimal air/fuel ratio
- Better than generic jets for consistency
Considerations
- Requires tuning knowledge; not plug-and-play without testing
Durability & Warranty
Expected Lifespan
Indefinite with proper tuning (brass won't wear out)
Warranty
Limited lifetime (Mikuni standard)
Maintenance
Inspect during carb cleans; replace if corroded
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