1975 Johnson 15hp
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- Опубліковано 7 лют 2025
- Okay, it's not an antique - or even a classic - but it's an interesting motor regardless. This represented OMC's best effort to build an outboard in the 10-15hp class and even today in 2011 nobody has done a better job. Modern 4-stroke and even the new 15hp eTec weigh about double what this motor does. It's quet, fuel efficent and very reliable, all the things most people want in a small outboard. It is, however, a very complex motor to work on.
Great video and informative. While I don't doubt you a bit about the "teething pains" in that era, I have a '73 9 1/2 hp my grandpa bought new and have never done anything to it except gear oil. Even with the points ignition... don't think I've ever changed the spark plugs either. Starts by the 3rd pull every time even beginning season. Remarkable!.
Looks real nice to me....I think the early 9.9/15s ran better at idle and midrange than the later models...The ignition can be a pain, but is reliable with a little extra maintenance. These engines can be a pain to work on, but have rugged and reliable powerheads and gearcases...
Your 1973 9.5hp shares almost no parts with the 1974+ 9.9 and 15hp - they are as different as chalk and cheese! The 9.5 low-profile motors used the OMC "Universal Magneto" found on all the twin cylinder OMC motors 3-40hp from 1952 to about 1970 and a variation continued until 1990! It is a tried & true design and (other than bad plastic on the coils) will work forever. On the other hand, the "Fireflash" low tension magneto was totally different and only used a few years on a handful of models.
how do you get it to charge the battery? does it have to be electric start?
Karo Staro The charging system, like the electric start, was an option. My observation is the early motors with electric start all seem to have the charging system. Later they made sail models that had just the charging system and were manual start.
You would need to find a parts motor and swap over all the parts. That's a lot of work - and the charging is probably the same amps as a good solar charger these days!