Mikuni Large Round Main Jets #112.5 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 optimal fuel delivery for your carbureted V-twin with this 4-pack of Mikuni #112.5 large round main jets. These genuine Mikuni parts are essential for riders looking to dial in their air-fuel ratio. Proper jetting ensures your Harley-Davidson or Indian Motorcycle performs at its best across the throttle range.
Why riders pick this
- Genuine Mikuni OEM part for reliable tuning
- Controls fuel delivery at cruise and mid-throttle
- #112.5 jet size for fine-tuning air-fuel mixture
- Convenient 4-pack for multiple tuning sessions
- Ideal for V-twin carburetors on Harley & Indian
Accurate jetting is critical for maximizing the performance and efficiency of your carbureted Harley or Indian V-twin. These Mikuni #112.5 large round main jets provide precise fuel metering at cruise and mid-range throttle positions. Whether you're compensating for elevation changes, exhaust upgrades, or air cleaner modifications, having the right jet size is key to a well-running engine. The convenient 4-pack ensures you have tuning flexibility and spares.
Optimized Fuel Delivery
- Genuine Mikuni OEM part for trusted quality
- #112.5 jet size for specific tuning requirements
- Large round design for compatible V-twin carburetors
- 4-pack provides tuning options and backup jets
Essential for Performance Tuning
Main jets control a significant portion of your carburetor's fuel curve, making their selection vital for a strong-running V-twin. Using the correct jet helps prevent lean or rich conditions that can hinder performance and affect engine longevity. Always consult your motorcycle's service manual or a professional tuner to determine the ideal jetting for your specific setup and riding environment.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FN100604-112.5
- Jet Size: #112.5
- 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 purpose of a #112.5 main jet?
A #112.5 main jet precisely meters fuel delivery to your engine at cruise and mid-range throttle openings. Selecting the correct main jet is crucial for achieving an optimal air-fuel ratio, which affects performance, fuel economy, and engine health.
How do I know if these jets will fit my Harley or Indian Motorcycle?
These jets are designed for V-twin motorcycles with Mikuni carburetors that use large round main jets. To ensure compatibility, you should verify the type of carburetor on your bike and its current jet specifications. Our Shop by Bike feature can assist with fitment confirmation.
Why should I buy a 4-pack instead of a single jet?
A 4-pack provides you with the flexibility to test different jet sizes for optimal tuning and keeps spare jets on hand. This is particularly useful if you frequently adjust your bike's setup or ride in varying altitudes and temperatures.
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 | 134-71125 |
| WEIGHT | 0.05 lb |
