West Coast Sailing is your source for Viper sailboat parts, rigging and accessories. The Viper 640 is the fast and fun one-design that almost didn't make it. Shortly after being named the 1997 Boat the the Year, the Viper lost its builder and went out of production. The design was so well loved that in 2005, a small group reestablished the class, recruited a new builder, and started a grassroots fleet. 20 hulls quickly grew to over 125. A keelboat in name only, the swift and highly responsive Viper 640 is a great fit for sailors looking for a modern, moderately athletic, and high-performance sportboat. Shop Viper 640 sailboat parts, rigging, and accessories with rigging guides, technical information, extensive selection, and fast shipping to help you get back out on the water.
Use the diagram below to reference Harken part numbers to appropriate application on your Viper sailboat. Parts recommendations are offered as a guide for common applications.
The Viper cockpit is very clean with a gnav in place of a traditional vang. The new 8:1 Harken gnav replaces the slider system with a captive bearing car designed for compression loads. The Harken IN8418 utility car removes most of the friction to make the system more powerful, reducing the need for a very high purchase, and making it far easier to use under load.
For cranking up the luff tension in fresh wind, the Viper's jib halyard is deflected through a 8:1 fine-tune. The double-ended system uses Micro Carbo Cams with X-Treme Angle fairleads, making it easy for the forward crew to adjust without leaving the rail.
The 2:1 ratchet-controlled jib sheet runs through Carbo T2s on the clew to low-profile pinstop cars for trim angle adjustments. In addition to moving the cars forward to round the foot of the jib, Viper sailors can also improve light-air performance by removing the top batten to keep the leech open.
Diagram provided by Harken. West Coast Sailing is an approved seller of Harken sailboat hardware.
General Parts & Hardware - We offer a huge selection of General Parts including hardware, blocks, cleats, shackles, accessories and more here.
Line - Great options for halyards, sheets, control lines, and rigging in a wide range of diameters and materials available on our Line page.
Apparel & Accessories - We also offer large range of Apparel and Accessories from all of your favorite sailing brands.
Product Suggestions - If you're looking for a specific part for your Viper 640 sailboat that you cannot find, let us know. We are actively working to expand our one design parts offering and welcome your input for parts you think we should be stocking to make it easier for you to get back out on the water. Submit you idea via our Product Suggestion Form (opens in new tab).
