Mikuni Large Round Main Jets #147.5 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.
Optimize your V-twin's carburetor with these genuine Mikuni large round main jets in size #147.5. Sold as a convenient 4-pack, these jets are engineered for precise fuel control. They ensure your Harley-Davidson or Indian Motorcycle receives the ideal fuel flow during cruise and part-throttle engine loads.
Why riders pick this
- Genuine Mikuni manufacture for trusted quality
- Specific #147.5 jet size for precise fuel tuning
- Large round design fits compatible Mikuni carburetors
- Includes four jets for versatile tuning and spares
For V-twin riders who demand precise control over their engine's performance, proper carburetor jetting is paramount. These Mikuni large round main jets, sized #147.5, are crucial components for fine-tuning your Harley-Davidson or Indian Motorcycle's fuel system. They allow you to accurately adjust the air/fuel mixture, which is vital for smooth power delivery and optimal engine efficiency, especially after making performance upgrades.
Reliable Fuel Control
- Genuine Mikuni manufacture for assured quality and consistency
- Specific #147.5 size for targeted fuel delivery adjustments
- Large round design for broad compatibility with Mikuni carburetors
- Convenient 4-pack for comprehensive tuning and keeping spares
Carburetor Tuning Flexibility
The main jet plays a significant role in how your V-twin performs across its mid-range and top-end. Having a 4-pack of these #147.5 Mikuni jets gives you the flexibility to experiment with different tuning setups or to have backup jets readily available. This is invaluable for riders who frequently adjust their bikes for varying altitudes, temperatures, or new performance parts.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FN100604-147.5
- Jet Size: 147.5
- 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 is the primary function of a main jet in a V-twin carburetor?
The main jet meters the amount of fuel delivered during mid-range and wide-open throttle operation, ensuring the engine receives the correct air-fuel mixture for optimal power and efficiency at higher RPMs.
How do I know if the #147.5 jet is the correct size for my motorcycle?
The ideal jet size depends on your carburetor model, engine modifications, riding altitude, and ambient air temperature. Always consult your Mikuni carburetor manual or a professional tuner to confirm the appropriate jet size before ordering.
Will these Mikuni jets fit my Harley-Davidson or Indian Motorcycle?
These are genuine Mikuni large round main jets and are designed for V-twin motorcycles equipped with Mikuni carburetors. They are not compatible with bikes that have other brands of carburetors installed, such as stock Keihin or S&S units.
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 | 134-71475 |
| WEIGHT | 0.05 lb |
