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  1. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Let me shoot a video of my spark show the flywheel. It might give some insight
  2. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I’ve got Spark so it’s gotta be timing then. Great!
  3. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I’m a nurse by trade and completely self taught. My dads mechanical knowledge is pretty much 0. Most everything I do is trial and error or stuff I find on here. I’m trying to become more competent with every motor. I’m 34, so 99% of these motors are 20+ years older than me. None of my buddies...
  4. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Very true! That’s my goal with this experience to learn how to diagnose it. I’ve been through all the steps I know… Compresssion check, spark check, make sure all my grounds are tightened, making sure I’ve got good fuel pressure in my bulb, making sure my plugs are not fouled. I’ve put fuel...
  5. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Will try this evening
  6. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I’ve tried 3 tanks, 3 hoses, full choke, no choke. Fuel in cylinders
  7. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Oh yeah. I get nothing. I even put it in drive/wot and cranked it with a drill. Nothing. I even sprayed carb cleaner in the carb to start, Nada
  8. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Manual choke, rope start
  9. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I think it should be fine. I have used motors numerous times without fault since it’s been rebuilt. I could blow air in carb when it was right side up and the carb wouldn’t let me blow air in when it was upside down.
  10. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I rebuilt carb 2 month ago. It has been used 3-4 times per week since. I’ve probably got 50+ hours on motor since carb was built. Fuel is less than month old, mixed properly, used the same tank and bulb I always do. No air leaks to note.
  11. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I can do that!
  12. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Not at all! Looks good!
  13. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Under fly wheel
  14. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Pictures of under flywheel posted in previous post. Looked good to me
  15. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Spark plug wires are ok. I cleaned the spark plugs really well. They weren’t particularly fouled out at all, but I will try a new set of plugs just for good measure.
  16. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Checked that one out already too! Replaced my fuel adapter, only thing left for me to do is unfortunately see if my carb is cracked 😱
  17. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I checked spark and compression today, spark jumps 3/8 inch gap well and compression is 96/100. I have probably got 50 hours on this motor since I replaced that cam roller and it’s run great. I assume I’ve got it linked and synced properly.
  18. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I put gas directly into the cylinders. It doesn’t fire. I do have a bunch of air coming out of the tell tail which I’ve never seen before.
  19. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    I’ve got 3 tanks and 2 hoses. I’ve rotated all of them and put fresh gas in
  20. J

    1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

    Cam roller
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