Hello, i just bought a 89, 184 champion. 1989 GT175 Johnson. 24'pitch. It doesn't have a plate on it. The guy i bought it from said it was running 67-68mph on gps. I took it out for the first time yesturday and the speedometer said around 62mph. The motor seemed to be running like crap after a while though. Just wondering if i needed a jack-plate or not. Seems like everybody but me has one. thanks for any info...........