1954 big twin

This topic has 18 replies, 11 voices, and was last updated 4 years, 6 months ago by Tinman.

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October 10, 2019 at 8:56 am #184939
Tinman
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US Member - 1 Year (includes $3 online payment fee)
Hello every. I have a 1954 25 hp evinrude. it’s all there. Electric start. Brass prop. Actually in pretty decent shape overall. Need to check compression but roping it over is a tough go. May have to hook up the starter for that. Was thinking about making it a winter tune up project. Anything to look out for or is it pretty straight forward tune up procedure? Haven’t have much experience with anything larger than an 18 hp. Thanks.
October 10, 2019 at 9:48 am #184945
2fast4me
Participant
Take pictures before disassembly, you will need them. Keep your removed items bagged and tagged for proper reassembly. Some long bolts in the wrong location can cause cracks and broken components. I haven’t gotten into my powerhead yet so if you need pictures? Just ask. There is a lot going on with the throttle advance on that one. Jim

2Fast4Me
October 10, 2019 at 10:19 am #184948
crosbyman
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Canada Member - 2 Years
if you dont have this go to the url on top !!

Joining AOMCI has priviledges 🙂
October 10, 2019 at 11:18 am #184958
garry-in-michigan
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Lifetime Member
Since it has the same magneto as the 18, you already know about checking the coils . . . You will find it much louder than he 18 as it does not have the rubber mounts and enclosed powerhead like the 18. The remote controls may have to be lubricated as the lithium (white) grease tends to dry out with age.
October 10, 2019 at 12:28 pm #184962
David Bartlett
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US Member - 2 Years
I have a 1954 Johnson 25. One of my favorite motors. With the plugs out it will pull over fine to check compression.

The cable operated throttle and spark advance is a bit different than the later engines, but works well. If you don’t already have one of Richard Whites timing tools, I really recommend you do. This motor will really start better and run nice when the ignition is spot on.

David Bartlett
Pine Tree Boating Club Chapter

"I don't fully understand everything I know!"
October 10, 2019 at 12:46 pm #184963
Tinman
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US Member - 1 Year (includes $3 online payment fee)
I have one of his timing tools. I use it on 5.5-18 hp. Does it use the same tool or do I have to purchase another one? Thanks for all the replies everyone.
October 10, 2019 at 12:58 pm #184964
frankr
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US Member - 1 Year (includes $3 online payment fee)
Unfortunately, it takes a different timing tool.
October 10, 2019 at 2:11 pm #184965
RICHARD A. WHITE
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Lifetime Member
That model uses the tool I have labeled #4 Timing Tool

http://www.richardsoutboardtools.com
classicomctools@gmail.com
October 10, 2019 at 3:07 pm #184968
jeff-register
Participant
US Member - 2 Years
If parts are around I would reseal the gears & impeller. Is that one a 6 volt system? Very nice motor!!
P,S,
Have the service manual if you need pages e mailed
- This reply was modified 4 years, 6 months ago by jeff-register.
October 10, 2019 at 4:06 pm #184975
Tinman
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US Member - 1 Year (includes $3 online payment fee)
Thanks Richard. #4. Got it. And yes it’s a 6 volt system. And jeff, yes I would like the service manual. Thank you.
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