Mikuni Large Round Main Jets #155 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 are a critical component for dialing in the fuel delivery on your V-twin's carburetor. Sized at #155, they help ensure your Harley or Indian motorcycle runs optimally at full throttle. Each 4-pack provides the essential parts for precise carburetor tuning.
Why riders pick this
- Genuine Mikuni component for reliable performance
- Exact #155 sizing for precise full-throttle fuel delivery
- Convenient 4-pack for tuning adjustments and spares
- Optimized for V-twin motorcycles with Mikuni carburetors
When you're chasing peak performance and smooth operation from your V-twin, precise fuel metering is non-negotiable. These Mikuni large round main jets, specifically sized at #155, are engineered to deliver accurate fuel flow to your engine's main circuit. Whether you're compensating for elevation changes, modifying your air intake, or fine-tuning an aftermarket exhaust, having the right main jet is key to unlocking your bike's full potential.
Precision Fuel Delivery
- Genuine Mikuni component for reliable performance
- #155 size for precise full-throttle fuel metering
- Supplied in a convenient 4-pack for tuning and spares
- Designed for V-twin motorcycles with Mikuni carburetors
Tuning for Performance
Optimizing your carburetor's jetting is fundamental for any serious V-twin rider looking to get the most out of their machine. A #155 main jet can be an essential step in achieving a balanced air-fuel mixture, preventing lean conditions that can harm your engine, or rich conditions that can bog it down. Consider these jets a cornerstone of a well-tuned Harley or Indian setup, especially when paired with other performance upgrades.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FN100604-155
- Quantity: 4 per pack
- Jet Size: #155
- Length: 4.4 in
- Width: 2.2 in
- Height: 0.6 in
- Weight: 0.05 lbs
- Country of Origin: Japan
Common questions
What does the #155 size mean for my V-twin?
The #155 size refers to the specific flow rate of this main jet, which meters fuel primarily at full throttle. It's a key factor in achieving the correct air-fuel mixture for your Harley or Indian.
Will these jets fit my Harley-Davidson with a Mikuni carb?
These are designed for Mikuni carburetors on V-twin motorcycles, including Harley-Davidson and Indian models. Always confirm your specific carb model uses large round main jets before ordering.
Why do I need a 4-pack of main jets?
A 4-pack provides multiple jets for fine-tuning your carburetor's fuel delivery. It also gives you spares for future adjustments or if you're working on multiple carburetors.
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 | 134-7155 |
| WEIGHT | 0.05 lb |
