Does anybody know where the DFI system gets its timing signal?
The D.F.I. systems are quite crude on these bikes, in that the fuel is squirted into the inlet tracts & the engine ‘draws’ what it needs. It’s not ‘sequential’ as in the latest systems, therefore is not ‘timed’ as such, although every engine revolution receives a squirt of fuel from each injector. The amount of fuel supplied is governed by the amount of time each injector is ‘open’ each time it squirts, controlled by pre-determined fixed parameters in the D.F.I. control unit. The system supplies what it thinks the engine needs based on a range of sensed variables, such as ambient air temp, engine coolant temp & throttle position. As you crank open the throttle, the throttle position sensor reduces the resistance on the current flowing through it, thus allowing the voltage to increase which tells the computer to keep the injectors open longer. As the engine coolant temperature increases, the temperature sensor increases the resistance, thus lowering the voltage and reducing the amount o
