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  1. M

    1963 Johnson Super Seahorse 40 HP (RDS-25D) top speed

    I am trying to figure out if my motor is performing at its maximum potential. Can anyone tell me what I should expect for the top speed? It is mounted on a 14' aluminum Texas Maid Osprey that weighs around 300 pounds. I am only getting about 24 mph. It would probably be more accurate to ask what...
  2. M

    1963 Johnson Super Seahorse 40 HP (RDS-25D) fuel/ oil ratio

    I have searched the forum and found some post that have different opinions about the fuel/ oil ratio for this engine. I was hoping someone may have the definitive answer. I know there have been post about this before so I apologize for posting it again. The sticker on the motor says mix 1 to 24...
  3. M

    1968 Evinrude 18HP runs only with choke on

    My 1968 evinrude 18HP starts very easy with choke on. When I turn the choke off, it will idle ok with just a little coughing. At full throttle, it will die if the choke is off. If I turn the choke on, it runs fairly smoothly and will achieve plane just not quite full speed.
  4. M

    Yamaha 15HP 4 stroke short shaft tiller handle

    I am looking at purchasing this motor and the current owner cannot find the serial and model numbers. Can you please tell me where these are located so that I can confirm year of motor as well as if it has been registered? Thanks
  5. M

    Losing Power/ Fuel Delivery 1968 18 HP Evinrude

    I have what I think is a fuel delivery issue. I have 100% replaced the ignition system but the symptoms do not seem to me to be ignition related. I start the motor, let it warm up, get going, open the throttle to full, reach plane for a few seconds, it then bogs down to about 1/3 throttle...
  6. M

    1968 18 HP Evinrude ignition timing

    Is it possible for the ignition timing to be off and if so, how is it adjusted. I have replaced every component of the ignition, removed wobble from the armature plate, rebuilt the carb, checked the compression and still am having low power output. Any other suggestions are appreciated. I am...
  7. M

    1968 18 HP Evinrude - low power output

    I am having an intermittent problem which is making diagnosis a challenge for me. Two weekends ago while cruising along, the motor slowed down to about half power, like it suddenly was only running on one cylinder. After about 5 minutes, the power came back up to normal. I didn't really do...
  8. M

    electric start 1968 Evinrude 18 HP

    I would like to put an electric start on my motor but cannot find much information about it. I know they are available from this forum as well as seeing my same motor for sale with an electric start. I have found the actual starter motor for sale new with the gear on it but I do not know what...
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