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Looking at the detailed specifications of both motorcycles Kawasaki KLX 250 S and BMW F 800 ST is a proper approach to determine which of the two is more likely to match your style of riding and to satisfy your preferences. When trying to make your mind on the next motorcycle, your personal levels of comfort should be the leading criteria. The long personal list of favourite motorcycle models can be narrowed to just a few ones after comparing their pictures and technical specifications. The best way to explore them is to actually sit on these bikes and check how much comfort you get with each of them.

Kawasaki-KLX 250 S   vs   BMW-F 800 ST
Picture of Kawasaki - KLX 250 SPicture of Kawasaki - KLX 250 S
Kawasaki manufacturer BMW
KLX 250 S bike name F 800 ST
Enduro mootorcycle type Sport touring
2015 year Since 2006
220 / 82 / 120.5 cm overall size L/W/H(cm)208 / 86 / 115.5 cm
249 cc engine displacement (cc)798 cc
Fuel injection 1x34mm Keihin fuel supply method Fuel injection - electronic
11:1 compression ratio 12:1
72x31.2 mm bore and stroke 82x75.8 mm
285mm (11.2 inches) ground clearance 145mm (5.7 inches)
1.6litres (1.7 quarts) engine oil capacity2.9litres (3.1 quarts)
7.7 litres (2 gallons) fuel tank capacity 16.0 litres (4.2 gallons)
160 km/h (99 mph) top speed229 km/h (142 mph)
22 hppeak horsepower 85 hp
21 nm (15.5 ft lbs)max torque 86 nm (63.4 ft lbs)
124 kg (273 lbs) dry weight182 kg (401 lbs)
138 kg (304 lbs) curb weight (wet weight) 204 kg (450 lbs)
43mm inverted telescopic fork, compression damping adjustment and 255mm front wheel travel front suspension 43mm telescopic fork with 140mm wheel travel
Uni-Trak compression and rebound damping, fully adjustable spring preload. The rear wheel travel measures 230mm. rear suspension die-cast aluminium single-sided swingarm, rebound damping adjustable with 140mm travel
80/100-21 front tyre size 120/70-ZR17
100/100-18 rear tyre size 180/55-ZR17
6-speed manual wet multi-disc transmission type 6-speed
digital CDI, slectric starting ignition / starting Electric
single semi floating petal disc with 240mm diameter and double-piston hydraulic caliper front brakes Dual 320mm discs with 4-piston Brembo calipers
240mm single petal disc and 1-piston hydraulic caliperrear brakes Single 265mm disc with 2-piston caliper, optional ABS
Chain drivefinal drive typeBelt drive
Liquid coolingcooling typeLiquid cooling
3.40 l/100km (69.2 mpg)fuel economy (consumption)5.10 l/100km (46.1 mpg)
technical specifications of Kawasaki KLX 250 Ssee data separatelytechnical specifications of BMW F 800 ST

Although BMW F 800 ST has a bigger engine displacement than Kawasaki KLX 250 S it doesn't necessarily mean it is more powerful or better performing bike. The bigger compression ratio of 12:1 belongs to the second bike. It represents the relation between the biggest and the smallest volume in the combustion chamber while the piston is performing its stroke movement. The bigger compression ratio means better fuel economy comparing engines with the same displacement because the mixture of fuel and air in the combustion chamber burns more effectively.
One of the advantages of Kawasaki KLX 250 S compared to BMW F 800 ST is the better fuel economy of 69.2 mpg it has. The other bike has a fuel economy of 46.1 mpg. Measuring the fuel economy in mpg shows how many miles of ride are covered by a gallon of fuel and measuring in l/100km shows the average fuel consumption in litters for every 100 kilometers riding.
tire sizesEach motorcycle should be fitted with the type of tyres that are specified for it. Your type of riding is also to be taken into account here. 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. Firstly the code shows the width of the tire measured in millimeters. The profile of the tire is revealed by the second number. The third number shows the size of the rim - its diameter measured in inches. A good way to save some time and money is to purchase your motorcycle tires online at competitive price.
Kawasaki KLX 250 S has bigger ground clearance than BMW F 800 ST (285mm vs 145mm). 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. That, in other words, is the smallest distance between any mechanical body part of the motorcycle and the surface of the road.
BMW F 800 ST appears to be faster than Kawasaki KLX 250 S with top speed of 229km/h against 160km/h for the other bike. While some motorcycle manufacturers pretend for precise top speed parameters, often these values are only approximate.liquid cooling system of a motorcycle
Both motorcycles are liquid cooled. Motorcycles with liquid cooling operate at narrower temperature ranges. Therefore liquid cooled motors can run with carburetion set to burn all the fuel in the mixture. The water pump drives the coolant from the engine into the radiator and back. The amount of cooling can be regulated via thermostat, which helps holding the temperature at a relatively constant level. A liquid-cooled engine happens to be quieter than the air-cooled one because all that liquid that surrounds the engine deadens mechanical noise.
As per their technical specifications both motorcycles have different types of final drive implementation.
chain final drive The final drive of the Kawasaki KLX 250 S is chain. Chain drives are by far the most popular final drive technology in the history of motorcycles and are the most economical way to drive power from the engine to the rear wheel. However chains have their down points - more frequent need of maintenance (lubrication and cleaning) which means that a biker should always keep an eye on the chain especially in rainy days or dusty roads.The BMW F 800 ST is driven by a belt.
Compression ratio Imagine an engine's piston is at the bottom of its stroke (step one) and moves up compressing the gas in the cylinder till it reaches its top position of the stroke (step 2). The compression ratio is the ration of the volume in step one over the volume in step two. Based on the information from the technical data of the motorcycles the values are accordingly 11:1 for Kawasaki KLX 250 S and 12:1 for BMW F 800 ST. Motorcycles with higher compression ratio may be recommended to use premium fuel only in order to avoid engine knocking. With internal combustion engines the higher compression ratio allows higher efficiency because the combustion temperature is reached with less fuel.
To keep the engine in good health it is important to observe the good qulity and proper level of the motor oil. Synthetic engine oils are considered the most technically advanced one and are more expensive than the mineral oils which come at lower price. The engine oil is to be changed on every 3700 miles (or 6000 kilometers) as a general rule. If you you synthetic oil then bigger mileage can be allowed between oil changes. A good practice is to replace the oil filter with each or every second oil change. Both motorcycles have different oil capacity according to the technical specs - 1.6 litres for Kawasaki KLX 250 S and 2.9 litres for BMW F 800 ST. When changing the oil it is advisable to put less than the specified oil capacity and to check the level. Pouring exactly the proper amount of oil needed is achieved by observing the level sight window or the dipstick marks.

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