Home › Forum › Ask A Member › 1969 Johnson 25 hp 25R69D
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Buccaneer.
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June 26, 2015 at 11:45 pm #1868
I just brought home the subject outboard today, after spending a whole $7.00
on an online auction. It was listed as "For Parts or Repair".
I have not decided what to do with it yet as I just started to inspect.It has spark on both cylinders, so that’s a good start.
Compression after 5 pulls, Top 98, Bottom 105It was set up with remote shift and electric start.
Starter motor is missing, as well as tiller handle.It’s missing the prop, electric choke solenoid, manual choke knob,
knob for carb adjustment, and engine "stop" button.The carburetor was there, but loose, so there may be parts missing
on it as well, i.e., springs, etc.Questions…..
What’s expected compression on this unit?If it’s converted back to all manual start & control,
are they are bear to start? My shoulders aren’t that
good anymore!The online parts diagrams at Discount Marine, etc., do not show
an electric starter or associated parts. Does that mean it was added
from a later motor, special order, or ??????
What part number would the electric starter be?Thanks for any help!
Prepare to be boarded!
June 27, 2015 at 12:17 am #18977100 would be acceptable, as you have.
That model doesn’t have the compression relief system. On a boat its not terrible to start, on a stand is a different story!
The starter was likely added on it.
http://www.marineengine.com/newparts/pa … um=ARC5376
http://www.marineengine.com/newparts/pa … OMC0175019
June 27, 2015 at 12:22 am #18978Here are more for sale
http://www.ebay.com/itm/STARTER-JOHNSON … a8&vxp=mtr
http://www.ebay.com/itm/NEW-STARTER-OMC … b3&vxp=mtr
June 27, 2015 at 1:09 pm #19010Thanks Chris, looks like there’s an abundance of starters.
Will have to see what little parts attached to the carb
may be missing, go thru everything, and see if it’s a runner.Prepare to be boarded!
June 28, 2015 at 11:05 pm #19117I looked at the seven dollar outboard a little more today,
and notice on the power head the dark green Johnson paint
peeling off, and pretty blue paint underneath……… then
I notice the core plug in the block that says…….
Evinrude15035.
Internet search shows that my 1969 Johnson 25 hp has
a 1961 Evinrude 18 hp power head in it.Questions….
Is this possible, or was someone being funny and put an older core
plug in it?
My repair manual only goes back to 1969, and it shows that
the 1969 thru 1972 18 hp, 25 hp Evinrudes, and the 20 hp and 25
hp Johnsons all had the same bore and stroke.Q. It appears from the manual that the difference in HP in these
motors come from the rpm’s they’re running at.
The carburetor on this unit looks just like the one that’s suppose
to be on the 1969 25 hp Johnson, and perhaps is.Q. If I get this motor running, how do I know if it’s going to be an
18 hp or 25 hp?I notice that the 1961 18 hp Evinrudes and 1969 Johnson 25 hp
have different part numbers for the pistons, but I’m not sure
if the bore and stroke are the same?Thanks for any enlightenment!
Prepare to be boarded!
June 29, 2015 at 12:56 am #19131The 18-20-25’s are not the same motors. If your block has an 18hp plug, unless someone was playing a joke, I’d assume it’s an 18hp motor. The other way to tell is to look for a P/N on the crank and cylinder head (which would be on the inside of the head, generally, but may be stamped on the outside on the port side near the plugs).
To my knowledge, there was a change in the pistons, crank, and cylinder head (and perhaps the port distances) to help get more HP. What may further complicate things is if someone decided to throw a 25hp carb onto an 18hp block. The carbs in the later 18 and 25’s use the same carb casting, but different orifices, so you’d have to pull the high-speed orifice and cross reference the orifice number with what the respective HP motors use.
I will say that if I see one of these showing 90-100PSI, 1st make sure the cylinders aren’t bone dry. That is usable, but in my opinion, getting on the low side for these size motors. I aim for 115-120+ on both cylinders as an OK number. Spray some fogging oil in there and see what happens. It may shoot up 30-40 points on your gauge and put you where you want to be (I’ve seen them go as high as, believe it or not, 150-155 on really nice motors).
The electric start bracket is the valuable part of that motor. Everything else is pretty common stuff.
June 29, 2015 at 2:31 am #19135Johnyrude, thanks for your reply. Good information. I’ll have to remember
to check the carb orfices to see which motor it belongs to. Guess for
the most part, I’ll go thru the carb, check out the points, timing, etc.,
and see if it runs, then decide from there.Prepare to be boarded!
June 29, 2015 at 11:40 pm #19184Before you go blowing any money on that motor it might do well to tear into the lower end .Does not cost much to open and reseal it but a bad clutch dog and worn forward gear can ruin your whole day .The reason I would do that is if that is truly a 1969 motor it is before the spring and detent balls were introduced and they loved to pop out of gear.It will run and idle with your compression numbers but don’t expect outstanding power.
June 29, 2015 at 11:54 pm #19186Benchrascal, Thanks for the sage advice. All I know about the lower
unit is that it seems to shift okay on the test stand.Prepare to be boarded!
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