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A good way to figure out whether Aprilia RS4 125 or Yamaha Fazer FZ-1 is better matching your personal style and requirements is to compare their specifications and features in details. Your choice of motorcycle should be all about your individual preferences and comfort level. After comparing one motorcycle versus another and so on, the circle of favourite models will be then eventually narrowed to several ones. Then these bikes in question could be best explored on the road where handling, performance and comfort of sitting position can be best felt in action.

Aprilia-RS4 125   vs   Yamaha-Fazer FZ-1
Picture of Aprilia - RS4 125Picture of Aprilia - RS4 125
Aprilia manufacturer Yamaha
RS4 125 bike name Fazer FZ-1
Sport bike mootorcycle type Sport touring
2011 year since 2006
195 / 74 / 114 cm overall size L/W/H(cm)206 / 65.5 / 112.5 cm
124 cc engine displacement (cc)998 cc
electronic injection fuel supply method Fuel Injection
12.5:1 compression ratio 11.5:1
58x47 mm bore and stroke 77x53.6 mm
135mm (5.3 inches) ground clearance 135mm (5.3 inches)
1.2litres (1.3 quarts) engine oil capacity3.7litres (3.9 quarts)
14.5 litres (3.8 gallons) fuel tank capacity 20.0 litres (5.3 gallons)
128 km/h (79 mph) top speed246 km/h (153 mph)
16 hppeak horsepower 150 hp
11 nm (8.1 ft lbs)max torque 106 nm (78.2 ft lbs)
107 kg (236 lbs) dry weight204 kg (450 lbs)
120 kg (265 lbs) curb weight (wet weight) 220 kg (485 lbs)
41mm inverted fork with 110 wheel travel front suspension telescopic forks with 130mm travel
asymmetric swingarm with monoshock. 130mm wheek travel rear suspension link type swingarm with 130mm travel
110/80-17 front tyre size 120/70-ZR17
130/70-17 rear tyre size 190/50-ZR17
6-speed multiple disc in oil bath transmission type 6-speed
electronic ignition with CDI capacity discharge ignition / starting Electric
dual 320mm floating discs, Brembo monoblock, radial four-piston caliper front brakes Two discs x 320mm
single 200mm disc with two-piston Brembo caliperrear brakes One disc x 245mm
Chain drivefinal drive typeChain drive
Liquid coolingcooling typeLiquid cooling
3.90 l/100km (60.3 mpg)fuel economy (consumption)6.25 l/100km (37.6 mpg)
technical specifications of Aprilia RS4 125see data separatelytechnical specifications of Yamaha Fazer FZ-1

Although Yamaha Fazer FZ-1 has a bigger engine displacement than Aprilia RS4 125 it doesn't necessarily mean it is more powerful or better performing bike. The first bike has the advantage of greater compression ratio of 12.5:1 than the other one. This ratio is the relation of the volume in the cylinder when the piston is at the bottom of the stroke to the volume in the cylinder when the gas is compressed and the piston is at the top of the stroke. When the mixture of air and fuel in the combustion chamber has bigger pressure (higher compression ratio) when it is ignited then it burns more effectively and therefore these bikes tend to have better fuel economy (comparing engines with equal displacement).
The bike with a better fuel economy is the Aprilia RS4 125 which can travel 60.3 miles with one gallon of fuel. Yamaha Fazer FZ-1 on the contrary can travel 37.6 miles with a gallon. The fuel economy of a motorcycle is either measured in mpg or l/100km, the first showing how many miles can be ridden with a gallon of fuel and the second showing how many litters of fuel are consumed on a 100km ride.
how to buy motorcycle tires The producer of each bike specifies the sizes of its front and rear tyre. Your individual riding style is another factor that determines which type is appropriate in your case. Tires have a code of numbers and letters printed on their sides and these are important to be understood properly when looking for matching tires. The width of the tire measured in millimeters is shown first. The profile of the tire is revealed by the second number. And the third number indicats the diameter of the rim in inches. Looking online for motorcycle tires is a good way to easily find the right size at low price.
Both motorcycles have the same ground clearance of 135mm. Usually given in millimeters in the technical data sheets, the ground clearance refers to the space between ground level and underside of a motorcycle’s chassis and sometimes is called ride height. In simple terms that would be the shortest line among all the lines drawn between the surface of the road and any mechanical part of the motorcycle.
Yamaha Fazer FZ-1 appears to be faster than Aprilia RS4 125 with top speed of 246km/h against 128km/h for the other bike. However sources may vary as to whether these top speed parameters are precise or only approximate.Motorcycle with liquid cooling system
Both motorcycles are liquid cooled. Motorcycles with liquid cooling operate at narrower temperature ranges. Therefore the liquid-cooled engine runs more efficiently and consistently. The coolant is circulating into the radiator and back to the engine driven by the water pump. A fan is turned on if needed by a thermostat to draw more air over the radiator in case the motorcycle slows down. Water jackets in a liquid cooled engine act as sound insulators and make it quieter.
chain final drive Aprilia RS4 125 and Yamaha Fazer FZ-1 are both driven by chain. Chain final drives are known for their simplicity and efficiency in driving power from the engine to the rear wheel of the motorcycle and are one of the most popular final drive options by far. However all chains require keeping an eye on them and proper lubrication when they get dry and cleaning when they get dirty.
compression ratio is a value that represents the ratio of the volume of gas in the cylinder when the piston is at the lowest point it is ever gonna go down and the volume of gas when the piston is at its highest point. The compressio ratio of Yamaha Fazer FZ-1 is 11.5:1 and it is 12.5:1 for Aprilia RS4 125 according to the motorcycles technical data above. Motorcycles with higher compression ratio may be recommended to use premium fuel only in order to avoid engine knocking. Engines with higher compression ratio are more energy efficient because they are able to extract more mechanical energy from a certain amount of fuel.
To keep the engine in good health it is important to observe the good qulity and proper level of the motor oil. Engine oils are different types as synthetic, mineral, part-synthetic and they all come at their price and qualities. The oil is usually to be changed after 6000km (3700 miles) after the previous oil change. The quality of the synthetic oil allows up to 5000 miles (8000 km) between oil changes. The oil filter needs to be replaced too and that is usually to be done with the oil change. According to the technical specs the engine oil capacity is 1.2 litres for Aprilia RS4 125 and 3.7 litres for Yamaha Fazer FZ-1. The values of the oil capacity here can not be used as a precise measurement when changing the oil. The exact amount of oil you pour in is to be judged by the current level shown on the oil level sight window or dipstick.

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