4hp powerhead interchangeable with 8hp?

G

gherrera

Recruit
Joined
Sep 20, 2010
Messages
2
Hello all,

I have a 4hp Johnson outboard (in the 80's I believe), that has a better bottom end than an 84' 8hp Johnson outboard that I just purchased. At a quick glance, these motors seem to be almost identical, and I was wondering if I could swap the powerhead from the 8hp, to the 4hp lower end. I am going to verify the years, but just wanted to know if anyone out there knew for sure if they are the same bottom end?

Thanks in advance,

George
 
D

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: 4hp powerhead interchangeable with 8hp?

You're gonna have to post the model numbers, both of those motors used for a lot of years.
 
Vic.S

Vic.S

Rear Admiral
Joined
May 4, 2004
Messages
4,721
Re: 4hp powerhead interchangeable with 8hp?

They certainly are interchangeable for some years but the BRP parts catalog does not list the Deluxe 4 hp for 1984, only the version without reverse gear, although it was available I believe in some markets

Exactly the same in 1986 and1987 !
 
Chinewalker

Chinewalker

Fleet Admiral
Joined
Aug 19, 2001
Messages
8,902
Re: 4hp powerhead interchangeable with 8hp?

THe 4hp/4.5hp (Deluxe full gearshift model) uses a different mid-section than the 8, but the lower units are the same.
 
G

gherrera

Recruit
Joined
Sep 20, 2010
Messages
2
Re: 4hp powerhead interchangeable with 8hp?

Thank you for the replies. Both motors have the Forward/Neutral/Reverse gearshifter, so it seems like the midsection may be different then? I will check the years tonight though to make sure.

Thanks again,

George
 
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