Question: In 2006, for emissions reasons, India Yamaha Motor replaced its RX 100 two-stroke motorcycle with the Yamaha Crux. What type of engine does the Crux have?

full_context: Document 1: Modenas Kriss series: The Modenas Kriss series is the debut 4-stroke underbone motorcycle series by Malaysian motorcycle manufacturer, Modenas. The original Kriss 110 was developed through a partnership with Kawasaki, which partly owned Modenas, based on Kawasaki Kazer 110 underbone model. The Kriss is actually named after a Malay traditional weapon, "kris", though some motorcycle shops in the United Kingdom had mistakenly advertised the model to be named from the acronym of a famous American motorcycle racer, Kenny Roberts because Modenas had once built some racing motorcycles for Modenas KR Motorcycle Grand Prix team.
Document 2: Yamaha RS-100T: Yamaha RS-100T Torque induction series, also known as RS-100 series, is a series of two-stroke motorcycle models manufactured by Yamaha Motors Co. Ltd as a successor of the Philippines' most popular 2T motorcycle/tricycle model. It debuted in 1977 especially for the Asian market. While the older Yamaha RS-100 uses a pressed steel frame that also acts as the main body, the RS-100 uses steel tubes for the frames and metal cover sets for the body.
Document 3: Yamaha Libero (G5): The Yamaha Libero G5 is a 106 cc, single-cylinder four-stroke motorcycle from India Yamaha Motor. Its predecessor was known as just Yamaha Libero. Unlike Libero G5, Libero had tachometer and round headlights but lacked fuel gauge. However, Libero G5 came with a sporty headlight and fuel gauge, but lacked the tachometer. A new set of air scoops with a honeycomb grille do dual duty; directing airflow over the engine block and also neatly covering the gap between the engine and the fuel tank. The Libero G5’s frame continues to be the tubular dual-cradle type.
Document 4: Yamaha RX 100: The Yamaha RX100 is a 98 cc two-stroke single-cylinder air-cooled motorcycle that was manufactured between 1984 and 1996 in India.
Document 5: Yamaha Crux: The Yamaha Crux is a 106 cc, single-cylinder four-stroke motorcycle made by India Yamaha Motor. The Crux is designed for Indian markets. It was launched in 2004 replacing RX 100, as 2-Stroke engines were not able to meet government's emission norms.
Document 6: Honda Africa Twin: The Honda Africa Twin is a dual-sport motorcycle made by Honda in three versions, 1988 to 1989 as the "650 cc " V-twin XRV650, then from 1990 to 2003 as the "750 cc " V-twin XRV750T, and then from 2016 to present as the "1000 cc " parallel-twin CRF1000L.
Document 7: Yamaha SS 125: The Yamaha SS 125, is a rechristened version of Yamaha Gladiator, is a 125 cc motorcycle, produced by India Yamaha Motor.
Document 8: Yamaha Passol: The Yamaha Passol was an electric scooter manufactured by Yamaha Motor Company beginning in 2002, and sold only in Japan. Weight was 44 kg and claimed range 32 km . It was described as the first mass-produced electric motorcycle in Japan (the Peugeot Scoot'Elec was produced earlier). It had a lithium-ion battery. A Passol-L model with the same motor and bigger battery was released in 2005, and a related electric, the EC-02, featuring a built-in iPod dock, also was released in 2005.
Document 9: Yamaha Fazer (India): The Yamaha Fazer is a motorcycle produced by India Yamaha Motor, a subsidiary of Yamaha Motor Company.
Document 10: Honda Crosstourer: The Honda Crosstourer (also called VFR1200X) is a dual-sport motorcycle made by Honda since 2012. It was announced at the 2010 EICMA motorcycle show. The 1237 cc V4 engine is a re-tuned version of the engine that was first used on the 2010 VFR1200F model. The fuel injection mapping, camshaft, and valve timing have all been revised to produce lower power than the VFR1200F, claimed by Honda to be 95 kW versus 127 kW , but the power output is focused at lower and middle engine speeds.
Document 11: Honda XRE300: The Honda XRE 300 is a single-cylinder dual-sport motorcycle designed and manufactured by Honda in Brazil. It was launched in August 2009 to simultaneously replace the Japanese firm's two South American on/off-road motorcycles: the XR250 Tornado and the NX4 Falcon. Unlike these motorcycles' 250 cc and 400 cc engines, the fuel-injected (Programmed fuel injection) 300 cc engine in the XRE300 meets Brazil's new PROMOT 3 emissions rules. It has an anti-lock brake (ABS) option.
Document 12: Suzuki SX4: The Suzuki SX4 is a compact car and crossover developed jointly by Japanese automaker Suzuki and Italian automaker Fiat sold between 2006 and 2014. It was available as a hatchback and sedan, with the former available in both front and four wheel drive. In 2013, a new generation was launched, called Suzuki SX4 S-Cross — now exclusively a mini SUV, with a sedan version not offered. The first and second generation SX4s sold alongside one another until 2014. The SX4 sedan was replaced with the Suzuki Ciaz.
Document 13: Yamaha RX 115: The Yamaha RX 115 is a standard motorcycle with a 115 cc two-stroke engine manufactured by Yamaha Motor Company. Debuted in 1981, the RX 115 is popular in Malaysia, Thailand, Pakistan, Turkey, Uruguay, Singapore, Venezuela, Colombia, and Dominican Republic.
Document 14: Yamaha RZ350: Yamaha RZ350 (RD350LCII) (liquid cooled) is a motorcycle powered by a twin-cylinder two-stroke engine, reed valved 347 cc engine. The bore and stroke are 64 x . Coming out in 1983, it was the evolution of Yamaha's popular and well known RD350 (1972–75) and RD350LC (1980–86). Production was carried on into the 1990s and a different version with no YPVS power valve in the engine was used in Yamaha's Banshee ATV until its final model year in 2006 in the United States. Yamaha Motor sold the Banshee in Canada until 2008. There were several other models, the 1985 RZ350F, 1986-92 RZ350F2,N,NF, and the 1992-5 RZ350RR were produced in Brazil. The picture shown to the right is a model with an aftermarket, "Expansion Chamber" higher flowing, high-performance exhaust system, devoid of the catalytic converter and other exhaust pollution control items.
Document 15: India Yamaha Motor: India Yamaha Motor Private Limited (IYM) is the wholly owned Indian subsidiary of Yamaha Motor company, Japan Joint-investor with Mitsui & Co., Ltd. Yamaha Motor Company,Japan made its initial foray into India in 1985 as a joint-venture with Escorts Group. In August 2001, it became a 100% subsidiary of Yamaha Motor Co., Ltd, Japan (YMC). In 2008, Mitsui & Co., Ltd. entered into an agreement with YMC to become a joint-investor in India. It produces a range of motorcycles for domestic consumption and export including the FZ, SZ, Saluto, Fazer, and YZF.
ground_truth: four-stroke