Re: 1970 Evinrude 25hp just purchased!! I have problems...
Samo is correct, that motor is a pin drive prop, so there is no through the hub exhaust. The pic that Whywhyzed posted is what you should see - exhaust and a "healthy" spray of water. I don't know this particular motor well but it may have a thermostat in it. If so, you might not see water coming out in 10 - 20 seconds. You should see it soon thereafter, though. Also, if you are checking the water pump for function, don't run the motor on a hose because it will force feed the cooling system and will not give you an accurate feel for the condition of the pump. It is much better (and not that hard with a motor of this size) to run it in a barrel.
I think the advice to change the impeller on a motor that is new to you, is advice that should be taken. It is possible that the housing, water tube grommet and base plate were changed recently by the last owner, but you should examine them to be sure. If in doubt, buy the whole kit because, as was also pointed out, it's not that expensive and ends up being "cheap insurance." I tend to do complete replacements at times just because I would rather get it all done at once.
Have fun with it!
PS: If you look at Whywhyzed's pic, you will see an oval shaped access plate on the side of the midsection. That is where the coupler for the gear shift rod is - it is definately easier to deal with than the smaller motors, where the coupler can only be accessed by dropping the LU about a 1/2 - 3/4 inch!
