How does the ReCyclizer work?
Engines can be tuned for optimal performance or maximum fuel efficiency. BMW, in their desire to adhere to today's environmental demands, have chosen to adjust the fuel systems of their motorcycles to run as clean and fuel efficiently as possible. The fuel system is governed by the Motronic engine management, a pre-programmed system which injects an exact amount of fuel at a given throttle position, air temperature and RPM.

The Motronic, based on input signals, will adjust the air-fuel ratio to approximately 14,7:1, which will make the engine run 'clean' and fuel efficient. The drawback of this lean mixture will cause the engine to run less smoothley with decreased performance. Experience shows the engine will run smoothest at approximately 13:1, a slightly richer fuel mixture. The Motronic can be adjusted into delivering this richer fuel mixture by changing the input signals, such as the air temperature measurement. Colder air is heavier and contains more oxygen. The ReCyclizer changes the air temperature measurement input by lowering the temperature, making the Motronic believe the air mass has increased. The Motronic will react by injecting more fuel to balance air-fuel ratio to 14,7:1. Because the air mass hasn't really changed, the air-fuel ratio will be 13:1, resulting in a smoother running and more powerful engine, with increased gas response.