Destroyer
God
Is it true these lower units weigh at a hundred pounds?
NO, not at all. I just changed mine from a 20" to a 25" and the lower unit is only about 50-60 lbs... that's a guess, but I'm 68 and not in the greatest of shape and I had no trouble sliding the old one off and putting the extended one on. Looks like there are 4 of us with the same engine. (You, Randall220, Reelapeelin and me) Different years (Mines a 91') but same basic cowl and engine.
If the pee stream is running that hot it might not have the correct gasket, or sealer around the water pump. This happened to me and I wasn't aware of it, and had to take it to a pro to fix it. I'm also not to sure on the weight on the lower unit, it was heavy but not 100lbs heavy.