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Years of work, engine won't run. Running out of options and about ready to sell.

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  • Years of work, engine won't run. Running out of options and about ready to sell.

    72 Evinrude 50hp Lark, 50273c

    I've been working on the damned engine for years and it just refuses to run right (or maybe I refuse to fix it right, anyway..). The previous signs were low power output, poor fuel economy, and intermittent hard starting.
    Recently I discovered a crack in the fuel line that was effecting the vacuum. While repairing it, I decided to service the carbs and reed valves, and install new gaskets.
    After the work was all done the engine wouldn't start. I managed to get it to crank on by opening the throttle and cranking repeatedly. After that, she seemed to run well, but today when I tried starting it up I couldn't get a pop out of her.

    The engine has:
    New spark plugs/caps
    New head gasket (125 psi on both cyl.)
    New power pack- spark is fine
    Solid, tested wiring
    New fuel pump
    No evident leaks from p' head flange
    Good fuel & bulb that pumps to rock hard (good vacuum)
    Sparkling clean carbs and all new gaskets
    Floats adjusted to manual specs- no lower than 1 5/8, no higher than 1 1/8'', from flange to float bottom (I basically set them both in the middle of these figures).. maybe I managed to set them wrong somehow.
    Reed valves seem fine. When I removed them a few of the reed petals had bent up a bit so, by lightly tugging them down repeatedly, I managed to get them back flush with the block.
    The carbs don't have mixture needles, so that's out of the equation.

    .. I just don't get it!

    One thing I did notice yesterday was fuel leaking down the inside of the exhaust cover, out at the lower unit vents. I chalked it up to flooding, but could it be an indication of something else?

    Also, I removed the spark plugs today and gave it a few cranks with my hand over the plug holes. What I got was white-ish vapor, which I ***ume is correct; it didn't get my hand wet, but appeared to be vapor. However, the 'puffs' coming from cyl. 1 were noticeably stronger/more forceful than from cyl. 2. This doesn't seem good.

    ANY ideas???

    Thanks for bearing with me, I know this was a long one.

  • #2
    seen this same question on iboats !!!!
    check the reeds again.

    phill

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    • #3
      Got the reply- thought I'd put feelers out everywhere. Thanks for the advice, will check on new reed valves.
      Thanks

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