✓ VERIFIED
Jan 5, 2025
I put the kit in a 03 Heritage, the runout was 2 th the backlash was 1th the bike runs good. I like the mild cam. Feels good at low end. Getting away from the chain drive was the best.
S&S CYCLE
SKU: T14-661920
S&S Cycle Pinion Gear Dyna 31 Gear-Drive - Harley Big-Twin & Milwaukee-Eight
$131.95
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About S&S Cycle
S&S Cycle has built American V-twin performance parts in Viola, Wisconsin since 1958 — flywheels, carburetors, cams, cylinder heads and complete crate engines. When a Harley owner talks about a 124, a 128 or a 131 build, they are usually talking about S&S. Few names carry more weight with engine builders in this space.
Achieve precise cam timing and enhanced valvetrain stability with the S&S Cycle Dyna 31 pinion gear. Engineered specifically for gear-drive cam applications, this component is crucial for unlocking the full potential of your Harley big-twin or Milwaukee-Eight engine. It's a direct replacement designed to integrate seamlessly into your performance build.
Why riders pick this
- Engineered for Dyna 31 gear-drive cam systems
- Direct replacement for stock big-twin pinion flanges
- Ensures precise valve timing for optimal performance
- Compatible with Milwaukee-Eight and T-Series engines
- Robust construction for enhanced valvetrain stability
When you're upgrading to a gear-drive cam system, every component must be precision-matched for optimal performance and reliability. The S&S Cycle Dyna 31 pinion gear is crafted to meet these demands, ensuring accurate mesh and consistent operation within your engine's valvetrain. This gear is a vital link in maintaining precise valve timing, which is paramount for maximizing horsepower and torque.
Precision-Engineered for Performance
- Designed for Dyna 31 gear-drive cam systems
- Direct replacement for stock pinion flanges
- Ensures accurate valve timing and reliable operation
- Compatible with S&S 2007 T-Series and Milwaukee-Eight engines
The Foundation for Gear-Drive Cams
This S&S Cycle pinion gear is an essential upgrade for riders running or planning to run gear-drive cams in their Harley big-twin or Milwaukee-Eight. Its robust construction and precise machining contribute to a quieter and more efficient valvetrain compared to chain-driven systems. Proper installation is key, requiring careful attention to alignment and engine assembly procedures. Consult your service manual or a professional mechanic for installation, especially when dealing with critical engine components.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 330-0622
- Weight: 0.3 lb
- Category: Drivetrain / Pinion Flanges
Common questions
What Harley-Davidson engines does this pinion gear fit?
This S&S Cycle pinion gear is designed for Dyna 31 gear-drive cam systems on Harley big-twin engines from 2006-2021, and is also compatible with 2007-style T-Series and Milwaukee-Eight engines.
Is this a direct replacement for the stock pinion flange?
Yes, this S&S Cycle pinion gear is engineered as a direct replacement for the OEM stock pinion flanges on compatible Harley big-twin and Milwaukee-Eight applications.
Do I need special tools to install this pinion gear?
Installation involves standard engine teardown procedures and requires proper alignment of the gear-drive system. Specialized tools for cam chest work may be necessary. Professional installation is recommended.
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 | S&S Cycle |
| TYPE | Pinion Flanges |
| SKU | T14-661920 |
| WEIGHT | 0.3 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
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✓ VERIFIED
Dec 28, 2019
Overall this kit was an instant performance upgrade to my 2000 Superglide. With the 509 cam I had more torque in every single gear. The difference was noticeable from the start. The peace of mind that comes with gear drive is also great. Buyer should understand that the carb must be tuned after install it is a step up. This is an excellent product that shipped fast and worked exactly as described.
✓ VERIFIED
Sep 26, 2019
Top of the line.. dig S&S products. The craftsmanship of their products are second to none. Installation instructions are top notch and easy to follow and if you have issues with the install their tech support is awesome and willing to take the time and help you. Don't get in a rush when installing. The 509 cams were recommended to me by S&S for a TC88 engine in my 2005 Ultra Classic. They pull nicely and really woke up my heavy bagger.
✓ VERIFIED
Aug 14, 2019
Got bearings pressed into support plate. Cams into bearing. Waiting in time to break into camchest. So many riding days, don’t want downtime. Got ahold of some other upgrades to do while she’s apart.
