Mikuni Large Round Main Jets #100 - 4 Pack for 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.
Genuine Mikuni large round main jets in #100 size are essential for carbureted V-twin motorcycles. This 4-pack provides the critical components needed to accurately meter fuel into the main circuit under load.
Why riders pick this
- Genuine Mikuni manufacturing for reliable operation
- Precise #100 main jet size for accurate tuning
- Designed for large-round Mikuni carburetors
- 4-pack for tuning flexibility and replacement needs
These Mikuni large round main jets are designed to control fuel flow when your engine is under load and above ¼ throttle. The #100 jet size is a common and versatile option for re-jetting, especially after modifying your air filter or exhaust system, or when compensating for changes in altitude. Having a 4-pack on hand ensures you have the necessary parts for proper carburetor tuning and maintenance.
Consistent Fuel Flow for Enhanced Performance
- Genuine Mikuni manufacturing ensures quality and accuracy
- #100 main jet size for balanced fuel delivery
- Designed for large-round Mikuni carburetors
- 4-pack quantity for comprehensive tuning needs
Dialing in Your Harley or Indian Carburetor
Achieving the correct air-fuel mixture is paramount for optimal performance and engine longevity on your V-twin. Whether you're performing routine maintenance or chasing that perfect tune after performance upgrades, these #100 main jets are a key component. Always verify your carburetor's specifications and consult a tuning guide to ensure you select the appropriate jet size for your specific Harley-Davidson or Indian Motorcycle model.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FN100604-100
- Quantity: 4 per pack
- Jet Size: #100
- Length: 4.4 in
- Width: 2.2 in
- Height: 0.6 in
- Weight: 0.05 lbs
- Country of Origin: Japan
Common questions
What does a main jet do?
The main jet controls fuel flow through the main circuit when the engine is under load and above ¼ throttle. Changing jet size compensates for altitude, air filter, or exhaust changes.
How do I know if I need a #100 jet?
You'll need to test-ride and compare plug color, performance, and idle quality. Consult your carb manual or a tuning guide for your specific setup to confirm the correct jet size.
Will this fit my Harley or Indian?
These jets fit Harley-Davidson and Indian Motorcycle V-twin models with Mikuni large-round carburetors. Verify your carb bore size and jet style before ordering.
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 | 134-7100 |
| WEIGHT | 0.05 lb |
