Two 1979 6hp Johnson long shaft questions

jddens

Seaman
Joined
Aug 30, 2007
Messages
62
Two Questions:

1. What is involved in converting this motor to a short shaft,,, or can it even be done?

2. Can the HP of this motor be increased around 10hp?

Thanks!!!!!....John
 

1946Zephyr

Vice Admiral
Joined
Oct 21, 2008
Messages
5,556
Re: Two 1979 6hp Johnson long shaft questions

Yes, it has been done all the time. You need a longer drive shaft, water tube and shift rod coupler, plus the 5" extension. No, 6 horses are all you're going to get from it, sorry.
 

jddens

Seaman
Joined
Aug 30, 2007
Messages
62
Re: Two 1979 6hp Johnson long shaft questions

ok, so converting to short shaft in need shorter drive shaft,shorter water tube pickup, shorter shift rod coupler......sounds like it wouldn't be cost effective unless I have access to an old junk motor....and 6hp is 6hp.........thanks 1946Zephyr for the fast response!!!!
 

1946Zephyr

Vice Admiral
Joined
Oct 21, 2008
Messages
5,556
Re: Two 1979 6hp Johnson long shaft questions

Yea, if you want to save a few bucks, go to the top secret file at the top thread and try any of those salvage yards for your parts. It'll be a lot cheaper than buying new. Yea, the 10 hp (9.9) is a totally different motor than the 6 and has the same cubes as the 15. The 6 of your year has the tiny powerhead like the 5.5's did of the '50's Great motors though and an excellent design. They are much improved over the 5.5.
 
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