I'm assuming by "shifting speeds" you mean when the manufacturer recommend you select the next gear. This will vary from bike to bike depending on the engine, transmission, and final drive ratios. You would find the information for your specific motorcycle in the user manual that came with it.
For the same reason that cars have gears, to allow the vehicle to be driven at greater speeds.
Some motorcycles are slow! Of course, "fast" is a relative term. In general, motorcycles reach high speeds quicker than automobiles because they are very light in comparison, so even though their engines are not as powerful, the power-to-weight ratio is high. That is, each horsepower has fewer pounds to push. The fastest cars may have higher top speeds than the fastest motorcycles, however, because motorcycles have poorer aerodynamics. Generally, only very expensive cars are faster.
nope cause they're more dangerous at high speeds than motorcycles.
Most motorcycles have 5 speed transmissions although there are a number of bikes with 6 speeds including Harley's big twins.
Motorcycles are not measured in amounts of horse power. The KTM SX65 2014 edition has a cc of 65. It has six speeds.
A 2000 Jeep automatic that is not shifting correctly after it gets hot might have something wrong with the speed sensor that is located in the transmission. The speed sensor tells the transmission what gear to shift into at certain speeds.
could be the transmission is low on fluid... could be the transmission is low on fluid...
A 1000 cc sports bike can reach speeds up to 190 miles per hour. Many different makers of motorcycles uses the 1000 engine.
That depends on what your rear end gear ratios are. It varies greatly. As a default, you typically upshift at 1500 RPMs and downshift at 1000 RPMs.
motorcycles'
Ural Motorcycles and Ultra Motorcycles.
When a TO bearing starts to go bad you will hear noise when you push on the clutch. Also shifting will be more dificult when at slower speeds.