Agreed....as you well know, the 1970 20 and 25, still 2.5" bore .......about top the list for highest hp to weight ratio. They weigh barely 80 pounds....maybe closer to 75. That's only 3 pounds per 1 hp.........WOW!......Still got several of these around here. Toss them on your shoulder and walk a half mile portage. I put a boat cushion between. It would take Arnold Schwarzenegger to shoulder a 25 4 stroke across......but he's a few years older than me too....
The new Tohatsu 20 is only 97 pounds. Yamaha said they have a 125 pound 25 too. But most 25's now are 160 pounds.