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    Motor mounts worn on 72 25hp Johnson

    Well almost done “restoring” a 72’ 25hp Johnson. The motor was a parts motor I picked up but decided it deserved a chance because it looked so clean and runs great. However, there is a lot of play especially on the front. The play is up and down and upon inspection, I noticed the front (side)...
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    Best replacement point sets available

    I’ve read few threads about the newer points not being made correctly and issues setting the timing with them, including OMC’s sets. I ran into this with one outboard I have. The new replacement OMC points I installed were incorrect and I ran into issues getting the points to open correctly. I...
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    Shift rod adjustment Q-1972 25hp Johnson

    Just replaced the impeller on my 72 Johnson 25hp. After reinstalling the lower unit, I noticed the shift rod was not engaging correctly. It never shifted “correctly” since I purchased it. It shifts, but neutral doesn’t line up correctly with shift handle/setting. Is the only shift adjustment at...
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    Leaking 1972 25hp Johnson lower unit oil drain plug

    Well , I replaced the white washer with OMC part, still drips small amount of oil . I cleaned the threads on the drain hole and bolt. Still leaks. Tried using a o ring and plumbers tape on threads, still leaked. But it was full of oil and not dry when I applied the plumbers tape. The threads on...
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    BRP Engine Tuner ?

    I have a can of BRP Engine Tuner I’m getting ready to use on my main use motor , a 71 25hp Johnson. I read a lot of posts online about this product and similar products and not trying to open that can of worms again. I figure it can’t hurt to give it a try on the motor I use the most while...
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    Does this indicate water in lower unit oil?

    I changed the oil in the lower unit of my 71 25hp Johnson and noticed the oil looked tannish yellow while draining. See image of what I’m talking about. The other two outboards I also changed looked normal / dark-black colored. This is the first time I changed the lower unit oil on this...
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    Impeller replacement schedule

    Hello, curious if anyone can suggest how often to replace the impeller on early 70’s 25hp Johnson(OMC). I’m currently maintaining several of these outboards for my personal use on my fishing boat. I’m guessing it depends on how many hours I run them etc. I typically run them a few hours a month...
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    Testing ignition on older OMC’s

    Hello, I recently found this info that helped me diagnose an ignition issue on my older Johnson. Thought it was worth sharing for those attempting to rule out ignition issues without the need to unnecessarily replace parts. Sorry if this isn’t the location to post the links but I found them...
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    1970 25hp deceleration after run at WOT

    Hello, I have a 1070 25hp Johnson that’s been running great. Recently when I took it out, after running it for 5-10 min at WOT I noticed it began to decelerate. It didn’t seem like it was missing but instead just felt as though I was turning the throttle down. After I dropped the throttle and...
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    Slow speed needle valve for 1971 25hp Johnson

    The slow speed needle valve on my 71 25hp Johnson is worn and slightly bent although I straightened it the best I could. Im looking to replace it and noticed there are none available on eBay or any of the OMC parts online stores. The part number listed is 314691. I noticed there are slow speed...
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    1970 25hp Johnson lower paint question?

    Hello, I just picked up my second 25hp Johnson , a 1970 for 150$. I bought it to use as a parts motor for my 1971 25hp Johnson but it’s so clean and runs good I’m stuck with the issue of having two great motors. I’ve apparently caught the itch to work on these older motors. I Changed the gear...
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    Wiring bow trolling motor on 13’ aluminum V

    Hello, I just installed a new bow mounted trolling motor(older minn kota 50lb powerdrive) on my 13’ Gregor aluminum boat. Per Minn Kota’s recommendation I’m going to use 4awg wire(not marine grade only standard insulated-copper) to run power from my battery at the stern to the motor on the...
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    1971 25hp Johnson running rich

    Hello all, I have been working on my old 1971 25hp Johnson. I have replaced various parts with OMC replacement parts but my issue is the outboard still runs way too rich. I get a lot of sludge in the barrel and some loss of power. My mechanic thinks it may be a hole in the water jacket or...
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    Orfice plug/high speed jet 72 vs 72d?

    Hello, I have a 1971 25hp Johnson and recently purchased a new high speed jet/ orfice plug for the carb. I broke the old one trying to tighten it. ...Yeah I know.. Anyway, the replacement part is stamped 72d the original was stamped 72. I’m assuming these are the same. They look like the same...
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    71 25hp Johnson running hot?

    Hello, I have a 1971 25hp Johnson. I replaced the thermostat and a bunch of other parts including ignition components, rebuilt the carb, new impeller, gear oil etc. I noticed after running it, one side of the cylinder/ crankcase gets real hot. Almost to hot to touch. If facing the motor where...
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    1971 25hp run J4J Champion? Or ....

    Hello, forgive me for asking a question that I’m sure this has gotten some discussion in the past. It seems like my web searches have turned up a variety of different opinions. Well, I’m hoping to get some advice from folks that have had real life experience running a similar motor than mine. I...
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    Flush cooling system 71 25hp Johnson?

    I’m replacing the thermostat in my 71 Johnson 25hp. Is there anything I should do before changing it? Is flushing out the cooling passages necessary? If so, can you please explain the process? Thanks in advance for any feedback. Much appreciated
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    71’ 25hp Johnson still rough running

    Hello, I have been working on this 71’ 25hp Johnson for awhile now. Weird things have come up as I’ve been fixing it up. I recently discovered a ground wire on one coil was installed wrong and wore against the flywheel and broke at the connector. I fixed the connections and re-routed them so...
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    1971 Johnson 25hp convert to electric start?

    Hello all, thanks for the replies to my other posts. Well I finally seem to have gotten this old Johnson running good ...fingers crossed. It’s a pull start and I’ve heard that it’s not super difficult to convert it to electric start. Any recommendations in this process? Those of you that have e...
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    Sync cam throttle on 71 Johnson 25hp

    Hello, I’ve been trying to adjust the cam roller position in order to line it up to the two marks on the cam of my 1971 25hp Johnson. I read the service manual for my motor and did the recommended steps . I set the throttle to where the roller sits between the two marks on the cam and loosened...
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