I’m not certain they all do, but the theory is running the engine in the opposite direction as the wheels counteracts the centrifugal forces generated by the wheels and tyres at speed.
The centrifugal forces on the wheels and tyres act to keep the bike running straight and upright, so have to be counteracted when the bike is turned and banked.
The only benefits of an electric motorcycle are that the energy cost is lower using a rechargeable battery, as power from the grid is cheaper than producing it using fossil fuel with a petrol engine due mainly to very high taxation, and lower carbon emmissions if the battery is charged using renewal energy.
Curently they are relatively heavy due to the weight of the battery, and have a very limited operating range between re-charges, which take many hours.
They are also for more expensive.
Rake is the angle of the steering head and it can be increased by lowering the rear suspension or lifting the front.
The rear can be lowered by reducing the spring preload, replacing the suspension links or fitting a shorter shock or spring, the front by increasing preload, moving the yokes up the fork on some models where as standard the forks protrude from the top yoke.
You could also fit longer forks.
For a radical change such as seen on some choppers, the frame is modified by tilting the head stock, which requires cutting and welding.
Please be aware that motorcycle suspension is quite complex, and alterations can adversely affect the handling.
Increasing the rake will slow the steering.
We run motorcycle training courses at Blyton for those looking to get an ACU Road Racing Competition Licence, to prepare riders for the ACU’s ‘Basic Riding Assessment’.
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British Superbike School 