Mikuni Rubber Flange Adapter - Harley Touring, Softail, Dyna
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.
This genuine Mikuni rubber flange adapter is crucial for a perfect seal between your Mikuni carburetor and the intake manifold on your Harley-Davidson. Manufactured in Japan, it ensures a leak-free connection and optimal engine performance.
Why riders pick this
- Genuine Mikuni OEM part
- Made in Japan for superior quality
- Seals carburetor to intake manifold
- Dampens engine vibrations
- Prevents vacuum leaks and rough idle
- Direct fit for Mikuni carburetors
A proper seal at the intake manifold is paramount for any V-twin, especially when running a performance carburetor like a Mikuni. This Mikuni rubber flange adapter is an OEM-spec component designed to prevent vacuum leaks that can lead to rough idle, poor throttle response, and inconsistent fueling. Its rubber construction also helps to dampen vibrations, contributing to the longevity of your carburetor and intake system on Harley Touring, Softail, and Dyna models.
Reliable Seal for Mikuni Carburetors
- Genuine Mikuni OEM part, made in Japan
- Creates a secure, airtight seal to the intake manifold
- Rubber construction dampens engine vibrations
- Prevents vacuum leaks for stable idle and fueling
- Essential for Harley-Davidson models with Mikuni carbs
Maintain Optimal Fuel System Integrity
Over time, rubber components can harden and crack, leading to vacuum leaks that severely impact engine performance. Replacing a worn or old flange adapter with this Mikuni OEM part is a critical maintenance step to ensure your V-twin's fuel system operates as intended. It's an ideal choice for riders performing a carburetor service or upgrading their intake on compatible Harley Touring, Softail, and Dyna motorcycles.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FHS42/018-45K
- Length: 3.9 in
- Width: 3.25 in
- Height: 1.15 in
- Weight: 0.24 lbs
- Country of Origin: Japan
Common questions
What is the primary function of this Mikuni rubber flange adapter?
This adapter is used to create a sealed connection between a Mikuni carburetor and the V-twin engine's intake manifold, which is critical for preventing vacuum leaks and ensuring proper fuel-air mixture.
Is this a genuine Mikuni OEM part?
Yes, this is an authentic Mikuni OEM part, identified by part number FHS42/018-45K, and it is manufactured in Japan to Mikuni's original specifications.
Will this adapter fit my Harley with an aftermarket carburetor?
This adapter is specifically designed for Mikuni carburetors on V-twin engines. While it fits many Harley Touring, Softail, and Dyna models, you should confirm your carburetor model requires this specific Mikuni flange 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 | Intake/Carb/Fuel System |
| SKU | 14-1985 |
| WEIGHT | 0.24 lb |
