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Start ShoppingMIKUNI #70 Large Round Main Jet - High-Performance Brass Fuel Jet for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with the MIKUNI FN100604-70 Large Round Main Jet. This precision-crafted brass jet delivers consistent fuel flow for enhanced performance, responsiveness, and reliable operation in motorcycles, ATVs, and other off-road vehicles.
Key Features
- Brass Construction: Durable and corrosion-resistant for long-lasting performance in demanding environments.
- 6mm Orifice Diameter: Precise fuel flow control for optimal engine tuning and power delivery.
- Clip-On Design: Simplifies installation and allows for quick adjustments without complex modifications.
- Precision-Engineered: Manufactured to exact specifications for seamless integration with MIKUNI carburetor systems.
Why Choose This Product
Whether you're fine-tuning your engine for racing or maximizing performance in rugged terrain, this MIKUNI main jet ensures reliable fuel delivery. Its lightweight brass construction resists clogging and maintains accuracy over time, while the clip-on style makes it easy to install and adjust. Perfect for riders who demand precision, durability, and hassle-free maintenance in their powersports equipment.
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Upgrade your powersports engine's fuel delivery system with the MIKUNI FN100604-70 Large Round Main Jet. This precision-crafted brass jet delivers consistent fuel flow for enhanced performance, responsiveness, and reliable operation in motorcycles, ATVs, and other off-road vehicles.
Key Features
- Brass Construction: Durable and corrosion-resistant for long-lasting performance in demanding environments.
- 6mm Orifice Diameter: Precise fuel flow control for optimal engine tuning and power delivery.
- Clip-On Design: Simplifies installation and allows for quick adjustments without complex modifications.
- Precision-Engineered: Manufactured to exact specifications for seamless integration with MIKUNI carburetor systems.
Why Choose This Product
Whether you're fine-tuning your engine for racing or maximizing performance in rugged terrain, this MIKUNI main jet ensures reliable fuel delivery. Its lightweight brass construction resists clogging and maintains accuracy over time, while the clip-on style makes it easy to install and adjust. Perfect for riders who demand precision, durability, and hassle-free maintenance in their powersports equipment.
| SKU | GM5C4D1D1D |
|---|---|
| MPN | FN100604-70 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (e.g., Honda XR series, Yamaha YZ, Suzuki RM) | 1980-2025 |
| Kawasaki | KX, KLX, Ninja (select carbureted models) | 1975-2005 |
Frequently Asked Questions
Fits most Mikuni round-slide carbs including VM, BS, HSR, and TM series. Check your carb model.
This is a main jet (controls fuel flow at wide open throttle). Needle jet is different part.
Single jets sold individually for custom tuning. Main jet kits available with multiple sizes.
No, Mikuni jets have different threading. Keihin uses PJ or PD series jets.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet cleaning wire or compressed air
Pro Tips
- Verify jet size with carb markings. Clean jet thoroughly. Test plug chop after install to confirm mixture
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing wrong size jet
Comparison vs Stock/OEM
Direct replacement or upgrade for OEM Mikuni jets in Japanese bikes
Improvements
- Precision machined for consistent flow
- Pure brass for durability over cast stock jets
Considerations
- Precise sizing needed for tuning; stock may be oversized/undersized
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning (metal part)
Warranty
Limited lifetime (manufacturer defect only)
Maintenance
Clean with carb cleaner every service; inspect for clogging
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