thanks I got 2 similar 3.9hp and one XL sailboat boat version of the 4hp (apparently a more rare version) but no sailboat :) Got to get rid of some plus several E/J 4hps ..... ...the shed is filling up
Clean the surface of the chipped area with carb cleaner and just smooth it out with some JB high strength mix file smooth on the side and top and close it up.
the alternative is to leave it, close it, test it if it works don't fix it .
jmho
We need model !! we just do not know what "old" is .... to yound fellows everything is old :-)
answers to coils, condenser, point, and.. impeller condition ! nedded after inspection .
if compresssion lost pull the cyl head and check the head gasket ... they some times blow at the center point between cylinders.
they can get hot in a tub do not run them wot in a tub
u should post the mdl# no charge coils in old 4hps
the older ones only have ignition coils usually at cracked up if you did not pull the FW to bring it back yo life...
Condensors likely shot also ....repalce! points usually just need a touch up and set .020 but new ones always...
like it or not smart enough or not your corner mecaninc but you may want to try asking ChatGpt about the innards and options to proceed.
it will search the world for you
and maybe come up with a way out
B.O.A.T. break out another thousand they say...
wiring wise this is probably typical although not your year
https://maxrules.com/graphics/omc/wiring/25_35_82-83_elec-remote.jpg
https://maxrules.com/graphics/omc/wiring/77-78_55HP.jpg
Also, what ignition switch do I need? see diagram
Are factory service manuals available? yes but MAX...
You are surely correct as I have never worked on one of those and many more. yet I truly think this rabbit can wait. I will let op continue on his journey as I await the happy ending.
I doubt grease in itself help ignition being an insulator anyway there are several high temperature grease products on amazon. Some by Permatex good to -46C to + 1650 C
you can make this as complex as you wish. I think you should fix the spark problem and worry about grease and oil after. You are working on a 57 year old engine and things and products haved evolved... greasing a spring should not be a major problem. Become a happy boater.
Sometimes just asking an intelligent AI platform can provide some valuable info .. not always 100% but pretty good
what is OMC type D marine lubricant
OMC Type D Marine Lubricant is a specific gear oil used in older outboard motors made by Outboard Marine Corporation (OMC), which included...
ok in retrospect dieelectric grease is more for moisture in connectors and clamps no so much like true HV silicone...to stop arcing in old TV flyback transformers
give it a smell test burnt stuff usually smellls.. burnt :-)
points looked real dirty ..........hopefully a good clean...
hard to say for me anyway maybe Racerone can comment .. any burn marks are not very good and may indicate arcing althoug the stator is an AC generator not HV as in the ignition coil.
arcing may have taken place from a close by " hot spot" due to a " better" ground proximity than plug...
here is one comment from an intelligent source....subject to approval.. :-)
flywheel
On your 1969 Evinrude 55 HP (model 55973A) you do NOT have a steady “voltage feed” going to the points like on a simple automotive ignition.
That system is a battery-powered CD ignition with breaker points...
5v heading back to the breaker point may in fact be normal voltage... That wire is there only to "sense" the ground furnished by the points. I have no info or voltages specs on the internal desing of that " amplifier box" and how it increases the voltage burst going to the main ignition...
