Mikuni Large Round Main Jets #165 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.
These genuine Mikuni large round main jets, sized at #165, are crucial for accurately metering fuel volume into your V-twin's carburetor. Sold in a convenient 4-pack, they are essential for tuning fuel delivery. This ensures optimal performance at cruise and part-throttle RPM ranges on your Harley or Indian motorcycle.
Why riders pick this
- Genuine Mikuni quality for reliable fuel delivery
- Precise #165 sizing for critical cruise and part-throttle
- 4-pack for convenient tuning and having spares on hand
- Precision-drilled orifice for consistent fuel flow
When fine-tuning your V-twin's carburetor for optimal performance, every component matters. These Mikuni large round main jets, specifically in the #165 size, are designed to accurately meter fuel flow in the main circuit, especially crucial at cruise and part-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 and fitment
- #165 jet size for precise cruise and part-throttle tuning
- Supplied as a 4-pack for comprehensive tuning and spares
- Precision-drilled orifice for consistent fuel flow
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 #165 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 #: FN100604-165
- Quantity: 4 per pack
- Country of Origin: Japan
Common questions
What does a main jet like the #165 do?
The main jet controls the fuel mixture at cruise and part-throttle RPMs. A #165 jet provides a specific fuel flow, with higher numbers indicating a richer mixture.
How do I determine the correct jet size for my V-twin?
The correct jet size depends on factors like altitude, air temperature, and your engine's specific tune and modifications. Refer to your carburetor manual or consult a tuning guide for recommendations for your Harley or Indian.
Are these Mikuni jets genuine OEM parts?
Yes, these are genuine Mikuni jets manufactured to OEM specifications, ensuring quality and reliable performance for your V-twin carburetor.
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 | 134-7165 |
| WEIGHT | 0.05 lb |
