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  1. K

    76 Johnson 15 HP

    Don't know if this helps, but before the ignition replacement and with the upper seal leaking, I was getting 8 to 9 mph with me and my wife in the boat. But yesterday with just me in the boat and new ignition and new upper seal, I was only getting 7.. So it's literally slower than before.
  2. K

    76 Johnson 15 HP

    I've inspected the fuel pump diaphragm. I don't remember the high speed jet size but I will when I tear it down again. No idea about the exhaust path. I did post compression values. Both right at 100 psi pulling the rope. What is involved in checking the exhaust path? Just lower unit removal?
  3. K

    76 Johnson 15 HP

    Just check right now, yes, starts fine with either plug wire removed.
  4. K

    76 Johnson 15 HP

    Upper crank seal was leaking, I replaced it when I did the ignition. I guess it could be the bottom one too?
  5. K

    76 Johnson 15 HP

    Holding spark plugs close to ground on block while pulling rope both plugs fire hard and loud. I am using NGK plugs.
  6. K

    76 Johnson 15 HP

    I have verified that I have spark on both cylinders, but I will try this when I get it off the boat and back into the tank.
  7. K

    76 Johnson 15 HP

    I have synced the roller to the throttle plate, yes it seems to be opening all the way.
  8. K

    76 Johnson 15 HP

    I'm thinking at this point it has to be a carb issue. There isn't anything else it can be IMO. When I got the motor, I tore the carb down and cleaned all jets, reset the float, and cleaned out the low speed idle jet passageways. I did not remove all the plugs in the carb because it seemed to...
  9. K

    76 Johnson 15 HP

    Compression is around 100 psi pulling the rope. Haven't checked reed valves, fuel pump seems fine. It runs great, just doesn't seem to want to rev to Max rpm. Also noticed sometimes after running wide open, when I come down to a slow troll it has sort of a hiccup for a couple seconds and then...
  10. K

    76 Johnson 15 HP

    Well, I'm about at my witts end with this darm motor. I was certain that the faulty coils and wires were the problem. But here I am on the lake alone in a 14 ft v-hull aluminum boat going 7 mph wide open. I'm stumped.
  11. K

    76 Johnson 15 HP

    That is how I did it when I couldn't figure out a definitive answer as to which controlled what. From what I found, it is the starboard set.
  12. K

    76 Johnson 15 HP

    I'm quoting this from Leeroys Ramblings, this would indicate the starboard set controlling the top piston? : "The RH set of points (looking forward) are for the top (#1) spark plug."
  13. K

    76 Johnson 15 HP

    Looking at the motor from the tiller side or the prop side?
  14. K

    76 Johnson 15 HP

    I've been there many times. Just looking for a definitive answer I which point set controls what, but I think I have it figured out now.
  15. K

    76 Johnson 15 HP

    Was chasing a low power issue with the motor. Bought the motor used about a month ago and it ran. But it did not run well. So after looking over everything I finally decided to run it in the tank in the dark. I noticed both ignition coils were shorting to the spark plug wires. So I figured it...
  16. K

    76 Johnson 15 HP

    Could some please tell me which set of points fires which cylinder? I'm troubleshooting, or trying to troubleshoot, an ignition problem with my motor. In following the way the engine was wired when I got it, I think it might be firing 180° out.
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