1978 70 hp Vs. 1989 or 90 75 hp

cowboy_36618

Cadet
Joined
Mar 11, 2009
Messages
20
ok ,hello and yes I got another question . Recently I had asked about the compression on that 78 70 hp rude, now I have another ?. I took that 70 hp to a respectable boat shop here in town and it was there almost 4 weeks, I got it back yesterday, all they could tell me was that it was low on compression, they said it had 100 on #1, and 75 on #'s 2 and 3. That told me the engine was junk. So instead of paying $1200 to $1400 to get it rebuilt, Ive looked around and found a 1989 or 90 75 hp Evinrude for $1500 that another respectable mechanic has been thru and redone the lower end,such as water pump ,seals, thermostat. he said the power head had 132 to 135 across all 3 cylinders on compression ,so he didnt do alot to the top end. So I guess my question would be, comparing the 1978 70 hp to the 1989 or 90 75 hp , what kinda hp diffrence is there, if any?
I say 1989 or 90 because it was dark last night and I couldnt read the model number to determine the actuall year, Im going on what the mechanic told me.
One more thing is , is $1500 a good price for that 75 hp Evinrude wether if its a 89 or 90. what do you all think on that ?
Thanks for yalls input in the past.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 1978 70 hp Vs. 1989 or 90 75 hp

19-20 years old, i think the price is a little high.
 

cowboy_36618

Cadet
Joined
Mar 11, 2009
Messages
20
Re: 1978 70 hp Vs. 1989 or 90 75 hp

How about the horse power diffrence, will i notice much , if any at all , between the 2 motors ?
I found out yesterday its a 1988 70 hp, with diffrent carbs on it to make it a 75 hp, the mechanic told me last night.
 

Chinewalker

Fleet Admiral
Joined
Aug 19, 2001
Messages
8,902
Re: 1978 70 hp Vs. 1989 or 90 75 hp

No way to bump the 70 to a 75 by swapping carbs. They didn't make a 75 those years, so there aren't any carbs to swap with. Plus, the 70 was essentially the earlier 75 (1984 & prior) once they shifted horsepower ratings from the powerhead to the propshaft. If they really did swap carbs around, I'd be curious to know what carbs they did use. Funny things can happen when the wrong carbs are used...

- Scott
 
Top