Mikuni Large Round Main Jets #157.5 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.
Achieve precise fuel metering with these genuine Mikuni large round main jets, sized at #157.5. Sold in a convenient 4-pack, they are essential for dialing in mid-to-high throttle fuel delivery on your V-twin. These jets ensure your Harley or Indian motorcycle's carburetor is perfectly matched to your engine's demands.
Why riders pick this
- Genuine Mikuni quality for reliable performance
- Precise #157.5 sizing for critical mid-to-high throttle
- 4-pack for convenient tuning and having spares on hand
- Optimized for V-twin motorcycles with Mikuni carburetors
When fine-tuning your V-twin's carburetor for optimal performance, every component matters. These Mikuni large round main jets, specifically in the #157.5 size, are designed to accurately meter fuel flow in the main circuit, especially crucial at mid-to-high throttle positions. Whether you're adapting to different riding conditions, compensating for engine modifications, or simply seeking a smoother power band, precise jetting is key to maximizing your Harley or Indian's potential.
Optimized Fuel Metering
- Genuine Mikuni component for assured quality
- #157.5 jet size for precise mid-to-high throttle tuning
- Supplied as a 4-pack for comprehensive tuning and spares
- Designed for V-twin motorcycles using Mikuni carburetors
The Edge in Tuning
The right main jet can transform your V-twin's rideability, ensuring crisp throttle response and efficient power delivery. Using these #157.5 Mikuni jets allows you to fine-tune your air-fuel mixture, preventing issues like hesitation or excessive fuel consumption. For riders who demand the best from their Harley or Indian, precise jetting is a foundational step in any performance build, working seamlessly with upgraded air cleaners and exhaust systems.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FN100604-157.5
- Quantity: 4 per pack
- Length: 4.5 in
- Width: 2.2 in
- Height: 0.6 in
- Weight: 0.05 lbs
- Country of Origin: Japan
Common questions
What is the purpose of a #157.5 main jet?
A #157.5 main jet is used to control fuel flow at mid-to-high throttle openings in your Mikuni carburetor, allowing for precise tuning of your V-twin's air-fuel mixture.
Are these Mikuni jets compatible with Indian Motorcycle carburetors?
These Mikuni large round main jets are designed for V-twin motorcycles, including Indian models, that are equipped with Mikuni carburetors using large round jet seats. Verify your specific carb model for compatibility.
Do I need any special tools to install these jets?
No special tools are required beyond those needed for basic carburetor removal and disassembly. Familiarity with your specific carburetor model is recommended for a smooth installation.
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 | 134-71575 |
| WEIGHT | 0.05 lb |
