S&S CYCLE - 106-4840 - Camshaft - Easy Start - 640 Gear Drive - Twin Cam '99-'06 (except '06 Dyna)
Whether restoring a machine to factory spec or building something better, the S&S CYCLE 106-4840 gives you a camshaft kit that meets the demands of serious street use. Allows for easy start by initially reducing crank compression, but once the engine starts and rpm increases, the compression release lobe is centrifugally retracted and the engine runs normally, with full compression, and without any loss in performance. Intended for 95”/96”/103” and 110” engines with compression ratios between 10.5:1 and 11.5:1; strongest 3000 rpm - 6000 rpm range, giving you a level of quality that holds up across the full service life of the component. Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance.. Not for models with OEM compression releases.. High-lift springs and adjustable pushrods required.. The 106-4840 is the kind of component that earns its place in any build or repair by doing exactly what it is supposed to, every time. Sold as a complete kit.
Features
- Allows for easy start by initially reducing crank compression, but once the engine starts and rpm increases, the compression release lobe is centrifugally retracted and the engine runs normally, with full compression, and without any loss in performance
- Intended for 95”/96”/103” and 110” engines with compression ratios between 10.5:1 and 11.5:1; strongest 3000 rpm - 6000 rpm range
- Made in the USA
- Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance.
- Not for models with OEM compression releases.
- High-lift springs and adjustable pushrods required.
Specs
- Intake Open: 25°
- Model: Easy Start
- Application: Exhaust
- Application: Intake
- Exhaust Duration: 270°
- Exhaust Lift at TDC: 0.214”
- Exhaust Open: 65°
- Intake Lobe Centerline: 107.5°
- Exhaust Lift: 0.640”
- Riding Style: Street
- Type: Gear
- Exhaust Lobe Centerline: 110°
- Intake Lift: 0.640”
- Exhaust Close: 25°
- Grind: 640 Series
- Intake Close: 60°
- Intake Duration: 265°
- Intake Lift at TDC: 0.228”
- Product Name: Camshaft Kit
- Units: Kit
Frequently Asked Questions - S&S CYCLE - 106-4840 - Camshaft - Easy Start - 640 Gear Drive - Twin Cam '99-'06 (except '06 Dyna)
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
