Mikuni Large Round Main Jets #145 4-Pack - Harley & Indian V-Twin
About Mikuni
Mikuni has supplied carburetors and fuel-system components to the motorcycle industry for decades, and its HSR series remains a common choice for carbureted Evolution and Twin Cam V-twins where a clean, tunable fuel curve matters more than electronics.
Achieve optimal carburetor tuning on your V-twin with these genuine Mikuni large round main jets in size #145. Sold in a convenient 4-pack, these jets are engineered for precise fuel metering. They ensure your Harley-Davidson or Indian Motorcycle runs cleanly and powerfully during mid-to-full throttle cruising and acceleration.
Why riders pick this
- Genuine Mikuni OEM parts for consistent quality
- Specific #145 jet size for precise fuel tuning
- Large round design for compatible Mikuni carburetors
- Includes four jets for versatile tuning and spares
When maximizing the performance of your Harley-Davidson or Indian Motorcycle, every detail of your fuel system counts. These Mikuni large round main jets, sized #145, are critical for fine-tuning your carburetor's fuel delivery. They allow you to dial in the perfect air/fuel mixture, essential for smooth power delivery and responsive acceleration, especially after air intake or exhaust upgrades.
Precise Fuel Delivery
- Genuine Mikuni OEM quality for trusted performance
- Specific #145 size for accurate fuel flow control
- Large round head design ensures broad compatibility
- Convenient 4-pack for extensive tuning and emergency spares
Carburetor Optimization
The main jet plays a pivotal role in how your V-twin performs at higher RPMs and under load. Installing the correct jet, like this #145, helps prevent both lean and rich conditions, protecting your engine and delivering consistent power. This 4-pack gives you the flexibility to experiment with jetting changes or keep backup jets on hand for any riding condition.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FN100604-145
- Quantity: 4 per pack
- Length: 4.4 in
- Width: 2.2 in
- Height: 0.6 in
- Weight: 0.05 lbs
- Country of Origin: Japan
Common questions
What role does the main jet play in my V-twin's carburetor?
The main jet is responsible for controlling the fuel flow primarily during the mid-range to wide-open throttle operation. It's crucial for achieving the correct air-fuel mixture at higher engine speeds.
How do I know if the #145 jet is the right size for my motorcycle?
The ideal jet size depends on your specific carburetor model, engine modifications, riding altitude, and ambient air temperature. Always consult your carburetor's tuning guide or a qualified mechanic to confirm the correct jet size before installation.
Are these Mikuni jets compatible with all V-twin motorcycles?
These are genuine Mikuni large round main jets designed for V-twin motorcycles equipped with Mikuni carburetors. They are not suitable for bikes running other brands of carburetors like stock Keihin or S&S.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Mikuni |
| TYPE | Jets |
| SKU | 134-7145 |
| WEIGHT | 0.05 lb |
