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Start ShoppingMIKUNI Large Round Main Jet 57.5 - Precision Brass Fuel Jet for Carburetors
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Description
Upgrade your carburetor's fuel delivery system with MIKUNI's Large Round Main Jet 57.5. This precision-engineered brass jet ensures optimal fuel-air mixture for enhanced engine performance, responsiveness, and reliability in powersports applications.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- 57.5 Size: Precisely calibrated for accurate fuel metering in high-performance engines.
- M5 x 0.75 Thread: Universal compatibility with standard carburetor systems for easy installation.
- Compact Design: 0.25" diameter x 0.75" length for streamlined fuel flow and minimal pressure drop.
Why Choose This Product
Engineers and riders rely on MIKUNI jets for their unmatched precision and reliability. This Large Round Main Jet delivers consistent fuel delivery, improves throttle response, and supports efficient combustion. Its lightweight brass construction (0.1 oz) reduces system inertia while maintaining structural integrity. Whether you're tuning a motorcycle, ATV, or off-road vehicle, this jet ensures optimal engine performance across a range of operating conditions. The standardized thread size and dimensional specifications make it an essential tool for carburetor rebuilds and performance modifications.
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Upgrade your carburetor's fuel delivery system with MIKUNI's Large Round Main Jet 57.5. This precision-engineered brass jet ensures optimal fuel-air mixture for enhanced engine performance, responsiveness, and reliability in powersports applications.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- 57.5 Size: Precisely calibrated for accurate fuel metering in high-performance engines.
- M5 x 0.75 Thread: Universal compatibility with standard carburetor systems for easy installation.
- Compact Design: 0.25" diameter x 0.75" length for streamlined fuel flow and minimal pressure drop.
Why Choose This Product
Engineers and riders rely on MIKUNI jets for their unmatched precision and reliability. This Large Round Main Jet delivers consistent fuel delivery, improves throttle response, and supports efficient combustion. Its lightweight brass construction (0.1 oz) reduces system inertia while maintaining structural integrity. Whether you're tuning a motorcycle, ATV, or off-road vehicle, this jet ensures optimal engine performance across a range of operating conditions. The standardized thread size and dimensional specifications make it an essential tool for carburetor rebuilds and performance modifications.
| SKU | GM9CB6B235 |
|---|---|
| MPN | FN100604-57.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Universal) | Motorcycles/ATVs with Mikuni VM, TM, HSR, BS carburetors | 1980-2025 |
| Honda | XR series, CRF series | 1985-2005 |
| Yamaha | XT, YZ, WR series | 1990-2010 |
| Suzuki | DR-Z, RM, RMX series | 1980-2020 |
| Kawasaki | KLX, KX series | 1995-2025 |
Frequently Asked Questions
Fits most Mikuni VM series (VM26, VM30, VM34, VM36, VM38), TM series, HSR series, and BS series carburetors that use large round main jets. Check your carb model number.
Remove current main jet and measure with calipers, or check your carb tuning manual. Typical sizes range 50-220 depending on engine/modifications.
No, main jets are sold individually. Most people buy 3-5 sizes around their target for proper tuning.
Large round jets have larger flow capacity and are used in VM/TM/HSR carbs. Small round jets are for older round-slide carbs.
Yes, Mikuni jets are OEM quality and often better than stock factory jets for precise tuning.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet cleaning brush
- Carb cleaner
Pro Tips
- Always clean carb thoroughly before rejetting
- Verify jet size with calipers
- Make small changes (2.5-5 sizes) when tuning
- Record baseline settings before changes
Common Mistakes to Avoid
- Not cleaning jet passages before installing new jet
- Incorrect jet size selection
- Not verifying float height after rejetting
Comparison vs Stock/OEM
Precision machined brass construction matches or exceeds OEM specifications
Improvements
- Consistent flow rates across production batches
- Laser-etched size markings for easy identification
- Superior corrosion resistance
Considerations
- Often higher quality than some OEM supplier jets
Durability & Warranty
Expected Lifespan
Lifetime (does not wear out under normal use)
Warranty
Limited lifetime manufacturer defect warranty
Maintenance
Clean with carb cleaner during regular carb service (every 20-50 hours)
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