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Start ShoppingMIKUNI #120 Large Round Main Jet - Brass Fuel Jet for High-Performance Engines
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Description
Upgrade your engine's fuel delivery system with the MIKUNI #120 Large Round Main Jet. This precision-machined brass jet provides accurate fuel metering for enhanced performance, responsiveness, and consistent power output in two-stroke and four-stroke engines.
Key Features
- Jet Size #120: Precisely calibrated for optimal fuel flow rates in high-performance engines.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting reliability in harsh environments.
- 6mm Orifice Diameter: Clip-on design with 0.236 inch (6mm) orifice for precise fuel metering.
- Lightweight Design: Only 0.5 grams adds minimal weight while maintaining structural integrity.
Why Choose This Product
Whether you're tuning a racing motorcycle, off-road vehicle, or high-output engine, this MIKUNI jet offers unmatched precision and durability. Its clip-on style simplifies installation and adjustment, while the brass material resists wear from fuel and heat. The #120 size is ideal for engines requiring increased fuel flow without compromising throttle response. Perfect for mechanics and enthusiasts seeking reliable, high-performance fuel system components.
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Upgrade your engine's fuel delivery system with the MIKUNI #120 Large Round Main Jet. This precision-machined brass jet provides accurate fuel metering for enhanced performance, responsiveness, and consistent power output in two-stroke and four-stroke engines.
Key Features
- Jet Size #120: Precisely calibrated for optimal fuel flow rates in high-performance engines.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting reliability in harsh environments.
- 6mm Orifice Diameter: Clip-on design with 0.236 inch (6mm) orifice for precise fuel metering.
- Lightweight Design: Only 0.5 grams adds minimal weight while maintaining structural integrity.
Why Choose This Product
Whether you're tuning a racing motorcycle, off-road vehicle, or high-output engine, this MIKUNI jet offers unmatched precision and durability. Its clip-on style simplifies installation and adjustment, while the brass material resists wear from fuel and heat. The #120 size is ideal for engines requiring increased fuel flow without compromising throttle response. Perfect for mechanics and enthusiasts seeking reliable, high-performance fuel system components.| SKU | GM0EA053D1 |
|---|---|
| MPN | FN100604-120 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Universal) | Carbureted motorcycles, ATVs with Mikuni VM/PF/BS carburetors | 1980-2025 |
Frequently Asked Questions
Fits Mikuni VM, PF, BS series large round main jets (6mm orifice). Check your carb model markings.
Use a jetting kit or consult a tuner. #120 is common for mid-range tuning on 250-450cc engines at sea level.
Yes, large round (FN100604) has a different flow profile than small round (VM28/98). Confirm your stock jet type.
No, Mikuni jets are not interchangeable with Keihin without adapter or modification.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jetting gauge (optional)
Pro Tips
- Remove carb float bowl completely for access. Clean jet orifice with carb cleaner. Test plug chop after install to verify mixture
Common Mistakes to Avoid
- Installing wrong size jet
- Not cleaning carb passages before install
Comparison vs Stock/OEM
Direct OEM replacement or performance upgrade; precision machined brass for consistent fuel flow
Improvements
- Better metering precision
- Corrosion resistant
- Enables custom jetting for mods
Considerations
- Stock jets may be smaller; requires tuning to avoid lean/rich conditions
Durability & Warranty
Expected Lifespan
Indefinite (does not wear out under normal use)
Warranty
Limited lifetime from Mikuni against manufacturing defects
Maintenance
Inspect/clean during carb service (every 20-50 hours)
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