i have a 1977 Johnson 75hp, i was told it is a Stinger motor but not sure, the tag on the motor says the TIMING is supposed to be 16 degrees, but when i put timing light on it, it reads about 14 degrees, also the timing light is working on the other 2 cylinders but i can't get a reading on the flywheel to see where it is, & i'm still trying to figure out why it WONT GET UP TO FULL THROTTLE, there is spark but no reading on the other 2 cylinders, just the light going,,, also where is the timing adjuster & how do you adjust timing on it ???? PLEASE HELP