Combine the power of a motorcycle with the watery fun of a jet ski, and add the challenge of maintaining balance on an unpredictable perch, and you have the wetbike. Broadly defined as a cross between a motorcycle and a jet ski, this nautical transportation method first appeared on the market in 1978, popularized by the previous year's James Bond movie "The Spy Who Loved Me." Offering riders a true test of skill and balance, the original wetbikes measured just under 8 feet long and 26 inches wide, featuring a 50 horsepower, two-stroke Suzuki engine. Produced through the early 1990s, later versions added a more powerful 60 horsepower engine to the mix. The wetbike quietly faded out of vogue once easier-to-ride PWCs entered the market, and today it fills a collectible niche and represents a fringe hobby for select enthusiasts. Shop for the parts you need to fix or rebuild a wetbike by browsing the large inventory on eBay. Wet and wild with a devil-may-care vibe, wetbikes combine land and sea for retro fun.