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Start ShoppingMIKUNI FN100604-187.5 Large Round Main Jets - High-Performance Carburetor Fuel Jets for Racing & Off-Road
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Description
Upgrade your MIKUNI carburetor with these precision-machined large round main jets, engineered to deliver consistent fuel flow and maximize engine performance for racing, off-road, and high-output applications.
Key Features
- Exact Fuel Flow Control: Precisely calibrated to maintain optimal air-fuel ratios under varying load conditions.
- Compatibility: Designed for MIKUNI carburetor systems, ensuring seamless integration with existing engine setups.
- Durable Construction: Made from high-grade brass for long-lasting performance in demanding environments.
- Easy Installation: Standardized design simplifies replacement without requiring specialized tools.
Why Choose This Product
These main jets are essential for riders seeking to fine-tune their engine's fuel delivery system. Their robust construction ensures reliability during high-speed operation, while the precise flow ratings help prevent engine knocking and improve throttle response. Perfect for enthusiasts looking to enhance power output without compromising engine longevity.
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Upgrade your MIKUNI carburetor with these precision-machined large round main jets, engineered to deliver consistent fuel flow and maximize engine performance for racing, off-road, and high-output applications.
Key Features
- Exact Fuel Flow Control: Precisely calibrated to maintain optimal air-fuel ratios under varying load conditions.
- Compatibility: Designed for MIKUNI carburetor systems, ensuring seamless integration with existing engine setups.
- Durable Construction: Made from high-grade brass for long-lasting performance in demanding environments.
- Easy Installation: Standardized design simplifies replacement without requiring specialized tools.
Why Choose This Product
These main jets are essential for riders seeking to fine-tune their engine's fuel delivery system. Their robust construction ensures reliability during high-speed operation, while the precise flow ratings help prevent engine knocking and improve throttle response. Perfect for enthusiasts looking to enhance power output without compromising engine longevity.
| SKU | GMD6D0D472 |
|---|---|
| MPN | FN100604-187.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various | Mikuni TM/VM/PF Series Carburetors | 1980-2025 |
| Yamaha | YFS200 Blaster, YZ125/250 | 1990-2024 |
| Honda | TRX250R/300EX, CRF150R | 1985-2020 |
| Suzuki | LT250R Quadzilla, DR-Z400 | 1995-2024 |
| Kawasaki | KX125/250, KLX300 | 2000-2025 |
Frequently Asked Questions
Fits Mikuni TM, VM, PJ, and PF series large round main jets. Check your carb's jet holder type.
Use plug chop method or wideband O2 sensor to measure. Richer than stock for sea level or mods.
Universal for both; size depends on engine displacement, mods, and conditions.
Sold individually, but most carbs use 1 main jet per carb. Buy extras for tuning range.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Jet cleaning wire or carb cleaner
Pro Tips
- Remove float bowl completely for access. Test plug chop after install to verify fueling. Use in sets for best results.
Common Mistakes to Avoid
- Not cleaning carb before install
- Incorrect jet size selection without testing
Comparison vs Stock/OEM
Direct OEM-style replacement for Mikuni carbs; precision machined brass vs. potentially worn factory jets
Improvements
- Consistent flow metering
- Corrosion resistant
- Enables precise fueling adjustments
Considerations
- Must select correct size; no performance gain without proper tuning
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning; lasts engine life unless clogged
Warranty
Limited lifetime from Mikuni against defects
Maintenance
Clean with carb cleaner every 10-20 hours; inspect during service
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