Recent content by doggunit

  1. D

    1997 Johnson/Evinrude 2 cylinder 3 hp and 4 hp

    Are these motors the same as older lightwins of the same horsepower? It appears the ignition is different than my '67 Evinrude 3 hp. Is it a better system? Thanks.
  2. D

    Prop Efficiency vs. Top Speed

    My 17' boat is powered by an '04 Merc 40, mounted at 21.5" and at neutral trim, turning a Stiletto 10 1/2 X 12 hits 30.5 mph (GPS) at 5200 rpm WOT. Calculating the slip: 5200 (rpm) X .54 (gear ratio) X 12" (pitch) divided by 1056 = 31.9 mph and 30.5mph/31.9mph = 5% slip which seems unrealistic...
  3. D

    '90 Yamaha 3 cyl 30 hp

    Is this motor underrated at 30 hp and will it withstand saltwater use?
  4. D

    Exchange Powerheads

    Is it possible to replace the cylinder block of a '63 Johnson 28 hp with the larger bore 33 or 40 hp of the same vintage, use the original intake and carb?
  5. D

    Can't get RPMs

    My '63 Johnson 28 hp has good compression, recent carb overhaul, new ignition, but isn't delivering the horses. Symptoms include hesitation, slow revving, no increase in rpms from 3/4 to WOT, seems to like lean mixtures (1/2 turn from closed low speed, about 1/3 turn high speed), bottom plug is...
  6. D

    Pre-79 OMC control box

    Will a single lever OMC box set up for pre-79 cables work on a 60's twin currently on a Simplex box? If conversion kits are needed (end pieces, etc. )where can they be obtained? Thanks, R.C.
  7. D

    OMC Electramatic, mechanical shift

    My local outboard mechanic states that the OMC gear boxes of the late 50s, 60s were inherently flawed, that slipping out of gear is a common and recurring problem, due to premature wear of some part. Is this an accurate assertion?<br /><br />Do the Electramatic shift models, specifically the...
  8. D

    Lark transom height

    My wood boat project specs are 20" transom, I have located a '59 Lark in great shape for the vintage look, but its a short shaft. How high can I mount this engine and not reasonably expect cavitation (boat is 19' semi-planing or semi-displacement depending on top speed).
  9. D

    1964 Evinrude 40 prop

    Does this model year 40 hp use the same propeller as previous years, (shear pin aft under a cap held in place with a cotter pin)?<br /><br />The 1964 Evinrude catalog on "The Old OMC Site" describes this motor as having no shear pin, which prompts my question. I have a Michigan bronze 4 blade...
  10. D

    OMC Shift controls

    I am looking into hooking up a 60's Evinrude 40 hp to a later version OMC single lever control box, the cable ends are the same style, but need replacing due to shortness. Could there be a potential problem here with replacing the cables, any recommendations?
  11. D

    OMC Big Twins

    The motors about which I am concerned are the 1960's 33 and 40 hp models (mechanical shift), can one of these motors in good condition and maintained, be expected to deliver a reasonable service life, with occasional use in salt water?<br /><br />The 33hp appears not to be a thermostat equipped...
See more
Top