Tuning up old 2 stroke

Discussion in 'Boating & Boat Maintenance' started by Egorham, Mar 15, 2020.

  1. Egorham

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    Hey SD fish,

    I have an old 9.9 HP evinrude/johnson two stroke for my little skiff. After letting it sit for a while last time I tried to start it I couldn't get it to go. I did get it to 'turn over' once, but it didn't catch.

    What are the most likely culprits and what should I check first? I've heard I should drain the old gas, how do I do that? I've heard I should check the spark plug(s), but don't know where it is. So pretend you're explaining this to a kindergartner :emoji_disappointed_relieved:.

    I've got all the time in the world with everything shut down. Can take pictures tomorrow or the next day if that helps.

    I bet it would be a fairly simple issue for someone who knew what they were doing, but that isn't me. I may have aced calculus, but when I take the cap off the engine I'm basically looking at an alien's brain...

    Thanks in advance!
     
  2. Slater

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    back to basics, how long has the engine been sitting since it was run last?
    How old is the gas in your external gas tank?
    did you empty the tank & refill with fresh fuel including your 2stroke oil?
    Old gas is number 1 culprit to not starting if i was to guess without any further details....
    Start there, also these things dont like sitting with gas in the carbs, gas sitting in the carbs for a long time gums everything-up & causes running & no start issues....
    Back in the day it was normal practice disconnect the fuel source from the motor & let the engine run till it stalls so you somewhat empty the carbs of fuel...
     
    #2 Slater, Mar 15, 2020
    Last edited: Mar 15, 2020
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  3. camobass

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    There are some critical timing adjustments for the throttle if you take apart the carb. Honestly, If you don't know where the spark plugs are, I wouldn't attempt to work on it. Take it to someone who knows.
     
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  4. fisheromen

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    That is what my mechanic says! His name is Mark Eddo and he is awesome!
    meddo63@cox.net
     
  5. Tunakillerjoe1

    Tunakillerjoe1 Well-Known Member

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    +1 on taking it to someone to fix it. Sunset marine does good work, good piece of mind having it done right! Worth the $$ IMO-
     
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