My 74 had nothing on it except a solenoid to close the throttle more on shut down to prevent dieseling. My 81 was a diesel so I rode out the early 80’s without all the gas engine problems. My two 86’s had virtually everything on them that they do today with the computers and sensors. My 89 was the same with just a little more sophistication. So virtually everything was done in the five years of the early 80’s.