I just picked up a Johnson 8hp and have a couple of questions. Under the serial number is a "CE" with 96 next to it. Is this a 96 model motor? Also on the tiller, the end of the throttle has a knob that rotates, what is this? Also, is the fuel mixture 50:1 like my '76 evinrude 9.9? Thanks in advance for your help.<br />Hal