Harddrive Manifold Flange Adapter - 40mm Flange to Spigot Style - Harley & Indian V-Twin
About Harddrive
Harddrive is the house performance and replacement line built for American V-twins, covering everything from engine hardware and electrical to controls, lighting and chassis parts. The range is aimed squarely at Harley-Davidson and Indian riders who want a direct-fit part without dealer pricing, and it spans decades of model years — from Evolution-era Softails to current Milwaukee-Eight baggers.
Upgrade your V-twin's carburetor setup with the Harddrive Manifold Flange Adapter. This precision-machined billet aluminum component allows you to convert older two-bolt flange-style manifolds to accept modern spigot-style carburetors. It's an essential part for riders looking to broaden their carburetor options and optimize their intake.
Why riders pick this
- Billet aluminum construction for durability
- Converts flange manifolds to spigot style
- Accepts Mikuni HSR and Keihin CV carburetors
- Precision machined bore for optimal flow
- Expands carburetor upgrade possibilities
The Harddrive Manifold Flange Adapter is designed to simplify carburetor upgrades on your Harley-Davidson or Indian Motorcycle. If you're running an older two-bolt flange manifold but want to install a Mikuni HSR or a late-model Keihin CV carburetor, this adapter provides the perfect bridge. Its billet aluminum construction ensures durability and a reliable, leak-free seal.
Precision Engineering for Carburetor Compatibility
- Converts older two-bolt flange manifolds to a spigot-style intake
- Accepts popular Mikuni HSR and late-model Keihin CV carburetors
- Precision-machined billet aluminum for a clean bore and secure fit
- Facilitates broader carburetor choices for performance tuning
Unlock New Carburetor Options
Don't let an outdated manifold limit your performance potential. This Harddrive adapter opens up the possibility of running more modern and efficient carburetors on your V-twin engine. Whether you're chasing better throttle response, increased power, or simply more tuning flexibility, this manifold flange adapter is a critical step in achieving your goals. Ensure a proper seal with an appropriate manifold gasket during installation.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 23-133
- UPC: 191361117787
- Length: 5.98 in
- Width: 5 in
- Height: 1.49 in
- Weight: 0.6613 lbs
- Country of Origin: China (Taiwan)
Common questions
What type of carburetors does this adapter work with?
This adapter is designed to accept Mikuni HSR and late-model Keihin CV carburetors that utilize a spigot-style intake boot.
Will this adapter fit my existing manifold?
This adapter converts older two-bolt flange-style manifolds. Please inspect your current manifold's mounting style to ensure compatibility before ordering.
Do I need to use gaskets with this adapter?
Yes, for a proper and leak-free seal, it is recommended to use an appropriate manifold gasket between the adapter and your intake manifold.
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 | Harddrive |
| TYPE | Intake/Carb/Fuel System |
| SKU | 820-50526 |
| WEIGHT | 0.66 lb |
