The fastest production motorcycles of the late 1990s were extraordinary machines. The Suzuki Hayabusa arrived in 1999 with an engine that could push it past 190 mph. The Kawasaki Ninja ZX-12R followed with similar ambitions. Honda and Yamaha watched their top-speed numbers creep upward with each model year. These were the benchmarks, and the manufacturers behind them were engaged in an open arms race that European governments would eventually force them to abandon with a voluntary 186 mph speed limit agreement.While the Japanese establishment was busy squeezing more power from inline-fours, an American outsider was preparing something that would hold two Guinness World Records, run on diesel, kerosene, jet fuel, or in the words of its creator, good tequila. The engine came from a completely different industry. When a Boat Company Decided to Build a Motorcycle Mecum Marine Turbine Technologies was founded in Franklin, Louisiana, to build high-end gas turbine systems for offshore vessels, firefighting boats, and power generation packages. The company's specialty was taking Rolls-Royce Allison 250 series turboshaft engines, the same units that power Bell JetRanger helicopters, and repurposing them for marine applications once the engines had reached their FAA-mandated flight-hour limits. The logic was sound. A time-expired aviation turbine was no longer legal for flight, but it still had decades of reliable service left if rebuilt and run at lower stress levels than a helicopter demanded.Ted McIntyre, the company's founder, saw no reason the same principle could not apply to a road vehicle. The challenge was finding someone who could engineer a chassis capable of handling the power and packaging constraints of a turboshaft engine designed to fly rather than roll. McIntyre hired Christian Travert, a former motorcycle racer and custom builder whose previous work included machines built for African rally use. Travert's initial brief was to adapt an existing Harley-Davidson chassis to the project, but he quickly concluded that nothing on the market was capable of handling what he was about to build. The frame, swingarm, and almost every other component would have to be engineered from scratch. The MTT Y2K Turbine Superbike Ran a Helicopter Engine Through a Two-Speed Gearbox MecumThe MTT Y2K Turbine Superbike was unveiled in 2000, and it did not look like anything the motorcycle industry had produced before. At its heart sat a Rolls-Royce Allison 250-C18 turboshaft engine producing a claimed 320 horsepower at 52,000 rpm and 425 lb-ft of torque at just 2,000 rpm. The engine drove the rear wheel through a two-speed automatic transmission adapted from a three-speed Toyota Corolla gearbox, chain final drive, and a tubular aluminum frame that Travert engineered specifically for the application. The turbine itself weighed just 138 pounds, and the complete motorcycle tipped the scales at approximately 500 pounds dry. MTT offered a 250 mph performance guarantee, and the fastest recorded speed stood at 227 mph.The Y2K earned two Guinness World Records: the most expensive and the most powerful production motorcycle ever built. The $185,000 starting price put it beyond the reach of almost every buyer. Production was limited to approximately five units per year, each hand-built to the customer's specification. Standard equipment included carbon fiber fairings, Öhlins suspension, a rear-mounted camera replacing conventional mirrors, a color LCD display showing turbine parameters, a forward and rearward-facing radar detector, and a laser scrambler. The starting procedure alone took five steps, beginning with a computer boot sequence and ending with the rider holding the start button until the turbine reached 50 percent N1 speed. The exhaust exited downward at temperatures of roughly 1,300 degrees Fahrenheit, hot enough to warp asphalt and melt plastic at close range. The Allison 250 Turboshaft That Normally Flies a Bell JetRanger Mecum The Rolls-Royce Allison 250 series is one of the most successful small turboshaft engines ever built. Originally developed by Allison Engine Company in the 1960s for military applications, the powerplant went on to become the standard engine for the Bell 206 JetRanger, one of the most widely used helicopters in the world. Rolls-Royce acquired Allison in 1995 and continued production.When FAA regulations force an aviation turbine out of the sky after a fixed number of flight hours, the engine is far from worn out. It simply needs a rebuild to return to service. MTT sourced these time-expired turbines, rebuilt them to the company's own specifications, and mounted them inverted in the motorcycle frame so that the exhaust exited downward rather than sideways.The engineering implications of running a turbine on a motorcycle are significant. Unlike a piston engine, a gas turbine has almost no engine braking. Closing the throttle does not slow the vehicle in any meaningful way. The Y2K required the rider to shift into neutral and rely entirely on the Brembo brakes to stop. The turbine also idles at roughly 20,000 rpm and produces approximately 10 horsepower at idle, meaning the bike is always trying to move. The good news is that refueling is unusually flexible. The Y2K runs on diesel, kerosene, jet fuel, bio-fuel, or virtually any combustible liquid. McIntyre has famously joked that it will run on good tequila. Why Jay Leno Called It the Hand of God Pushing You in the Back Mecum Jay Leno took delivery of the first production Y2K, serial number 002, and became the motorcycle's most public advocate. In an interview, he described the experience of riding the bike in terms that have become the default quote for every piece written about it since. At idle it makes roughly 10 horsepower and feels docile. Once rolling, the acceleration becomes something else entirely. Leno described it as the hand of God pushing you in the back, and said the power-to-weight ratio was designed to lift a 10,000-pound helicopter, not move a 500-pound motorcycle.The most widely repeated Leno story involves a traffic light and a car that stopped too close behind. Looking at his rear-mounted camera display, Leno watched the bumper of the car behind him begin to crumple and melt from the turbine exhaust heat. The light turned green before the driver of the other car noticed the damage, and Leno accelerated away. The Y2K appeared in the 2004 Warner Bros film Torque, and between Leno's endorsement and the movie's exposure, the motorcycle became a cultural reference point even for people who would never see one in person. The original Y2K remained in production until 2005, when MTT briefly shifted its focus to other turbine applications before returning with updated variants based on the same concept. What the MTT Y2K Costs Today MecumThe MTT Turbine Superbike occupies a market category of exactly one. No other production motorcycle has ever used a turbine engine. And with production volumes of roughly five units per year, finding a used example is a matter of waiting for one of a few dozen existing owners to let go. The original Y2K carried a Guinness-certified $185,000 price tag when new, a figure that briefly made it the most expensive production motorcycle ever sold. Inflation and the updated 420RR variant have pushed the current new-order price to approximately $275,000, which now includes the 25th Anniversary Edition package with Öhlins suspension, BST carbon wheels, and aircraft-grade CNC aluminum components throughout.Used examples of the original C18-powered Y2K almost never appear on the open market, and when they do, they typically trade privately rather than through public auctions, so trying to value used models is almost impossible. Jay Leno's example is not for sale. The handful of known public listings over the past decade have asked figures in excess of $200,000, and there is no meaningful depreciation curve to reference because the bikes are too rare and too specialized to establish one.For buyers who want the original C18 experience, the options are to find an existing owner willing to sell or to order a current 420RR and accept that the newer bike uses the more powerful C20B turbine from a later Allison 250 variant. Either way, the motorcycle that started the turbine superbike category remains the only one in it, and the asking prices reflect that reality.Sources: Marine Turbine Technologies, Guinness World Records, Mecum.