Re: 1975 Johnson 50 hp upgrade to higher horsepower
It is possible, with your motor, to make it the same as the 60 hp 2 cylinder rather easily. We've done it several times. We have yet to have an owner pleased. The majority of the time the set up was off on the 40 or 50 so changing some things didnt really make any difference, therefore the disappointment.<br /><br />You still have the same bore, stroke and gear ratio. Any increase in torque is minimal. Most recreational hulls do not respond to such small increases in torque. <br /><br />The same goes for just about any family of motors you can think of (9.9/15, 40/50/60, 115/140, 120/140, 150/175, 200/225). Without increasing torque significantly you have to work with set up to increase efficiency and reduce slip.<br /><br />Take for example a crossflow and a looper. There are equal hp models in each design but the looper, because of torque, is stronger. <br /><br />All this long-windness takes us back to one thing. Tell us more about your set up and how it performs. Perhaps there is something to be gained without spending a lot of money.<br /><br />Good luck!