O2 sensors and two stroke engines do not get along well over long periods. The ETEC engine management uses throttle position, rpm, water temperature, air temperature and pressure (so it knows altitude), as well as muffler temperature. On the high altitude, deep snow models, there is also a mid tuned pipe temperature sensor. And actually, many modern four stroke automotive engines will ignore the oxygen sensor at full throttle - closed loop running is used for normal operation, but full power goes into open loop controls similar to the ETEC two stroke Ski-Doo models.
The ETEC direct fuel injectors on the cylinder head are 55 Volt injectors similar to the 600 HO ETEC and 600 R ETEC direct injectors. In addition, the 850 ETEC has 12 volt auxiliary fuel injectors on the throttle body which are used in periods of high loads or acceleration. The auxiliary fuel injectors are similar in application to a normal automotive multipoint fuel injector.
They don't have O2 sensor? If not how the ECU tune the AF ratio?
O2 sensors and two stroke engines do not get along well over long periods. The ETEC engine management uses throttle position, rpm, water temperature, air temperature and pressure (so it knows altitude), as well as muffler temperature. On the high altitude, deep snow models, there is also a mid tuned pipe temperature sensor. And actually, many modern four stroke automotive engines will ignore the oxygen sensor at full throttle - closed loop running is used for normal operation, but full power goes into open loop controls similar to the ETEC two stroke Ski-Doo models.
I would like to ask what injectors are on this engine?
The ETEC direct fuel injectors on the cylinder head are 55 Volt injectors similar to the 600 HO ETEC and 600 R ETEC direct injectors. In addition, the 850 ETEC has 12 volt auxiliary fuel injectors on the throttle body which are used in periods of high loads or acceleration. The auxiliary fuel injectors are similar in application to a normal automotive multipoint fuel injector.
I wish that there had been an engine sound instead of music.