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Thread: Evinrude Boat Motor!

  1. #16
    Fuel Injected! brian617's Avatar
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    Dammit Mark! Been looking for a deal on one of those for over a year now and you buy one for $40! I'll double your money on it if you can get it to Arkansas
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
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  2. #17
    LT1 specialist steveo's Avatar
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    see mark, there IS a market for smokey old direct drive 2-strokes!

    did you get the stand with it? you could sell that for 50 bucks too

  3. #18
    RIP EagleMark's Avatar
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    Yup stand came with it!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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  5. #20
    RIP EagleMark's Avatar
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    This motor is in incredible shape for a 1961! It's only a year younger then me and much better shape!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  6. #21
    LT1 specialist steveo's Avatar
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    yeah its a hell of a find, doesn't look like it's ever been used. i really think you should go fishin' with it before you sell it.

  7. #22
    RIP EagleMark's Avatar
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    What pre mix should I use to start this motor?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  8. #23
    LT1 specialist steveo's Avatar
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    initially start it on 25:1 or so. this is because you dont know how long its been sitting.

    then you can back off 35:1 or 40:1 with modern TCW3, or leave it at 25:1 if oil quality is unknown.

    i run all 2-stroke outboards at 40:1 personally

    they were originally spec'd for 24:1 mix, however oil has gotten a lot better.

  9. #24
    Fuel Injected! brian617's Avatar
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    If it were originally spec'd with 24:1 then that's the proper ratio to get the proper air to fuel ratio. A mixture of less oil and more gas will result in a richer AFR and conversely more oil less fuel will lean the AFRs. Think of it this way, there is only so much oil/fuel that can go through a fixed orifice (carb jet), so if more oil is going through less fuel makes it way through as a result. Unless you decide to change the jetting, or it isn't jetted properly, then keep close to the original ratio no matter the oil being used. It is a common misconception that more oil will make it "richer" it's quite the opposite.
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

  10. #25
    Fuel Injected!
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    egale mark you need to try that motor out so we can have a good fishing store

  11. #26
    LT1 specialist steveo's Avatar
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    Quote Originally Posted by brian617 View Post
    If it were originally spec'd with 24:1 then that's the proper ratio to get the proper air to fuel ratio.
    these old guys had both high and low speed enrichment needles externally accessable, meant to be tuned 'by feel' while in use, so the effect of oiling on AFR is kind of unimportant. but sure, run it at 24:1 if you want to. wont hurt anything, it's just more smoke.

  12. #27
    Fuel Injected! brian617's Avatar
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    Quote Originally Posted by steveo View Post
    these old guys had both high and low speed enrichment needles externally accessable
    Weedeater carb
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

  13. #28
    LT1 specialist steveo's Avatar
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    those old ones share a lot of parts with old lawnboy yard equipment (which was a johnson/evinrude product until the 90s i think). im sure there's a lawnmower out there somewhere with the same carb.

  14. #29
    Fuel Injected!
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    Quote Originally Posted by steveo View Post
    these old guys had both high and low speed enrichment needles externally accessable, meant to be tuned 'by feel' while in use, so the effect of oiling on AFR is kind of unimportant. but sure, run it at 24:1 if you want to. wont hurt anything, it's just more smoke.
    Yep the old Mercs ran the same style low/high speed fuel enrichment needles. Very similar to the way a Q-Jet metering rod works, just not intake vacuum dependent.

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