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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    I strongly disagree. The motors running good just replace all the maintenance items and there's not a lot. Gear oil, yearly. Spark plugs, when they're needed. Numerous grease points including the prop shaft. Any kind of fuel lines that don't look good, and water pump impeller or entire water...
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    Yes testing the overheat system and many other things are a must.
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    Choke is for start up only....on a two stroke you want it off right away. Assuming it's an electric and manual choke maybe the solenoid is sticky. You push the key in while turning to activate a electrical choke. Not sure what you have.
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    Funny....well I brain fart myself quite often, welcome to the crowd! 🤣
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    Lol.... Yes, might be your issue!
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    In picture 6....front of carbs, why are the choke plates closed?
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    Help! 2000 Johnson 90hp V4 overheating on one side only...

    Try new thermo stats....could be randomly sticking. The 103 is an issue as well.
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    1976 6HP Johnson Outboard issues with idle and starting

    In my opinion either your gauge is off or the motor is wore out. You say it runs good at high throttle.....is this on a boat in the water?
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    Johnson 25HP Model J25TEFNS Year 2002

    Okay....had to hurry off to work so a few terms are wrong but this video should give you some clues. If you need a close up of something let me know.
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    Johnson 25HP Model J25TEFNS Year 2002

    Both of your posted md numbers are incorrect I believe. Pretty sure it's this model. J25TESNF Try this site of the midsection area. Lots of parts and may get confusing. I have one so if you get stuck try and give more details and I can send pictures. Best of luck...
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    Muffs are for flushing mainly or doing small adjustments at or near idle... I would not tear down the engine until you check for good spark.
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    1981 Evinrude 15hp E15RCIS Prop

    Prop splines are frozen or corroded up. WD 40 or whatever penetrating oil you have with some mild heat on the prop portion. Careful with the heat because you have a rubber bushing. Once you've done that a little "hammer shocking" and pray. Work carefully and you might get rewarded. Sometimes...
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    Try this. Nice blue 3/8 crack.
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    "wet plugs" "starts and dies" "black fluid running from lower" Spark jump test....buy a cheap one, $15 at any auto parts store or get a nice one online. Could be one of many electrical issues. Rule out each thing and move on. Once running, take it out on the water and magically watch the...
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    1978 Evinrude 70HP- Trouble starting/idling/bogging under load

    Did you try a spark plug jump test or just see that it has spark?
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    Evinrude 55 1978 gearcase

    This is the breakdown of your motor, if it separated they would show it that way.
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    Fuel system

    When you run the motor does it clear up if you keep pumping the primer ball? What are your compression numbers?
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    Fuel system

    Fuel pump diaphragm must have torn or weeped. Must be smoking hard with all the pumping your doing.
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    Fuel system

    I agree, reading your statements....did you replace the primer bulb? Also, is the engine not running correctly?
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    Are vacuum hose diagrams available?

    I'm going to say it goes to both but it's an educated guess.
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