What is the primary benefit of using a gear drive camshaft system?

Gear drive systems offer a more direct connection between the crankshaft and camshaft, reducing timing slack. This results in more precise valve timing, which can improve throttle response and engine performance, especially at higher RPMs.

What engine modifications are recommended to get the most out of this camshaft?

This camshaft is designed for engines of 95 cubic inches or larger with compression ratios between 10.5:1 and 11.5:1. For optimal performance, ensure your engine meets these specifications and consider other supporting modifications as recommended by S&S Cycle.

Does this kit include everything needed for installation?

The kit includes the 640G gear drive camshaft set, inner gears, outer cam drive gear kit, and a camshaft installation kit. It is recommended to consult the manufacturer's installation instructions for any additional tools or specialized procedures required.

Specifications

Brand: S&S Cycle
Part #: 33-5181
UPC: 33-5181

S&S Cycle 99-06 BT Gear Drive 640G Camshaft Kit

Name: S&S Cycle 99-06 BT Gear Drive 640G Camshaft Kit
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-99-06-bt-gear-drive-640g-camshaft-kit-t14-663420
Price: 948.95 USD
Availability: BackOrder

$948.95

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S&S Cycle 99-06 BT Gear Drive 640G Camshaft Kit for Harley-Davidson Big Twin.

Key Features

Fits 1999-2006 Harley-Davidson Big Twin models (except 2006 Dyna).
Features a .640 inch lift camshaft, designed for high horsepower output.
Intended for engines 95 CID or larger with 10.5:1 to 11.5:1 compression ratios.
Optimized for operation in the 3,000 to 6,000 RPM range.
Includes 640G gear drive camshaft set, inner and outer cam drive gears, and a complete installation kit.
Gear drive design offers precise timing and reduced slack compared to chain drive systems.

This camshaft kit is designed for 1999-2006 Harley-Davidson Big Twin models, with the exclusion of the 2006 Dyna models. Please verify your specific model and year before purchase.

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About this part

Product Details

This S&S Cycle 640G Gear Drive Camshaft Kit is built for 1999-2006 Harley-Davidson Big Twin models, excluding the 2006 Dyna. It's designed to significantly increase horsepower, making it a popular choice for performance-oriented builds. This kit is specifically intended for engines of 95 cubic inches or larger, paired with compression ratios ranging from 10.5:1 to 11.5:1, and it operates effectively in the 3,000 to 6,000 RPM range.

The heart of this kit is the 640G gear drive camshaft, which features a .640-inch lift. This design is also utilized in S&S's own T124 engines, a testament to its performance capabilities. Unlike chain-driven cams, gear drive systems offer a more direct connection, reducing timing slack and providing a more precise valve event. This can lead to improved throttle response and overall engine efficiency at higher RPMs. The kit comes complete with the inner gears, outer cam drive gear kit, and a full camshaft installation kit, ensuring you have the necessary components for a proper setup.

When installing this camshaft, it's important to ensure your engine meets the specified displacement and compression requirements for optimal performance and reliability. Because this is a performance-oriented component, it's not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for detailed procedures and any specific tool requirements.