The Suzuki RG250 Gamma was a two-cylinder parallel, water-cooled 250cc two-stroke motorcycle produced by Suzuki from 1983 to 1987. One of the major features of the RG250 Gamma was its large power-to-weight ratio. Able to produce up to 45+ BHP at 8,500RPM and 38.4 Nm torque at 8,000RPM, weighing in at roughly 130kg. The RG250 Gamma was the first mass-produced motorcycle to have a lightweight aluminum frame and racing type aerodynamic fairing. The Gamma also had a very advanced 'full floater' suspension system for its time, with the first Mk1s having 'anti-dive' front forks (which locked the forks under hard braking to stop them diving). Due to this, the bike was dubbed the first street legal racer.
Water cooling is a method of heat removal from components and industrial equipment. Water may be a more efficient heat transfer fluid where air cooling is ineffective. In most occupied climates water offers the thermal conductivity advantages of a liquid with unusually high specific heat capacity and the option of evaporative cooling. Low cost often allows rejection as waste after a single use, but recycling coolant loops may be pressurized to eliminate evaporative loss and offer greater portability and improved cleanliness. Unpressurized recycling coolant loops using evaporative cooling require a blowdown waste stream to remove impurities concentrated by evaporation. Disadvantages of water cooling systems include accelerated corrosion and maintenance requirements to prevent heat transfer reductions from biofouling or scale formation. Chemical additives to reduce these disadvantages may introduce toxicity to wastewater. Water cooling is commonly used for cooling automobile internal combustion engines and large industrial facilities such as nuclear and steam electric power plants, hydroelectric generators, petroleum refineries and chemical plants. Other uses include cooling the barrels of machine guns, cooling of lubricant oil in pumps; for cooling purposes in heat exchangers; cooling products from tanks or columns, and recently, cooling of various major components inside high-end personal computers such as CPUs, GPUs, and motherboards. The main mechanism for water cooling is convective heat transfer.
Suzuki Motor Corporation is a Japanese multinational corporation headquartered in Minami-ku, Hamamatsu. Suzuki manufactures automobiles, four-wheel drive vehicles, motorcycles, all-terrain vehicles (ATVs), outboard marine engines, wheelchairs and a variety of other small internal combustion engines. In 2016, Suzuki was the eleventh biggest automaker by production worldwide. Suzuki has over 45,000 employees and has 35 production facilities in 23 countries, and 133 distributors in 192 countries. The worldwide sales volume of automobiles is the world's tenth largest, while domestic sales volume is the third largest in the country.
Power-to-weight ratio is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. Power-to-weight ratio is a measurement of actual performance of any engine or power source. It is also used as a measurement of performance of a vehicle as a whole, with the engine's power output being divided by the weight of the vehicle, to give a metric that is independent of the vehicle's size. Power-to-weight is often quoted by manufacturers at the peak value, but the actual value may vary in use and variations will affect performance.
In its five years of production the model underwent three major changes:
Mk1 (1983-1984): 45-46hp and 38 Nm torque. Very first bikes had a single brake disc on the front.
Mk2 (1985): Revised front fairings, mudguard and colour scheme and a slightly shorter wheelbase (from 1385mm to 1360mm)
Mk3 (1986-1987): Introduction of Suzuki's AEC system (Automatic Exhaust Control). This gave the bike a higher (around 49-50+hp) power rating.
(AEC system: Same idea as the now standard power valve design, but using a 'butterfly flap' to open and close an addition chamber on the cylinder head (open @ low RPM, closed at higher). This effectively expands the exhaust system at low RPM, to allow the exhaust to be tuned for high RPM. The AEC system opens at around 7500RPM)
The two-stroke power valve system is an improvement to a conventional two-stroke engine that gives a high power output over a wider RPM range.
In an internal combustion engine, the cylinder head sits above the cylinders on top of the cylinder block. It closes in the top of the cylinder, forming the combustion chamber. This joint is sealed by a head gasket. In most engines, the head also provides space for the passages that feed air and fuel to the cylinder, and that allow the exhaust to escape. The head can also be a place to mount the valves, spark plugs, and fuel injectors.
Mk4: (1987): There was also a very short-lived Mk4 version created for the Japanese home market, which had larger front discs, thicker tyres and larger diameter front forks. This model was never exported.
The RG250 Gamma was replaced by the RGV250 Gamma (V-Twin) in 1988.
The Suzuki RGV250 (Gamma) was a Suzuki high performance sport bike which had a great number of its features and design cues based on Grand Prix technologies and ideas. It is a race-replica based on Suzuki's 250 cc (15 cu in) GP bikes from 1987 to 1998, the RGV Gamma V-2 racer. This motorcycle replaced the RG250 Gamma, which employed an alloy frame with a two-stroke parallel twin engine. The bike produced over 50 bhp in a narrow power band between 8,000 and 11,000 rpm. The dry weight ranged between 128 kg (282 lb) (1989) to 140 kg (309 lb) dry weight.
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