I just got this motor but can not for the life of me find the serial or mod # anywhere on the thing. It has 55 Johnson Enforcer on the cover and the only plate that it has on it has data like type of fuel and cyl size ect... but on the plate it has family type # XIRXMOD45210 and on the motor I found a # 64425060 (prob some part lol ) . I was trying to find out the year on the data plate it says that it conforms to 1999 emissions .. so i am guessing it is close to that . It is a 2 cyl with large gearing. I was told it was a commercial motor. Any help would be great!!