Logo
FULL SITE MENU

Recent content by in-too-deep

  1. I

    '05 Johnson 30 hp 4-stroke Loses Power

    Only full throttle, but when it happens, power loss is noticed at all RPM's. It's like someone turned a dimmer switch down. Still runs smooth, just less of it. If I gently apply choke to try to increase fuel, it quickly stumbles like a typical choke response. I would think choking would improve...
  2. I

    '05 Johnson 30 hp 4-stroke Loses Power

    It is instant. ```````````````--------------------_______________________________ Then it might come back, then drop again, or it might run perfectly at full speed for many minutes. Timing light is a good idea.
  3. I

    '05 Johnson 30 hp 4-stroke Loses Power

    I understand what a spun prop would do... like shifting into neutral. It's not that. I did new spark plugs with no change. I'm going to inspect fuel pump and pulse line again. I'm confident there's no restriction of fuel... but there might be an undersupply of fuel. Two different things. But not...
  4. I

    '05 Johnson 30 hp 4-stroke Loses Power

    It doesn't drop a cylinder. Still runs smooth, just less power. I will inspect the fuel pump and pulse line. Might be on to something there. Edit: But wait.... choking doesn't help at all, so it can't be undersupply of fuel... ugghhhhhh I had the marine shop clean and sync the carbs last year...
  5. I

    '05 Johnson 30 hp 4-stroke Loses Power

    It revs up great and runs very well... except when it doesn't. I took prop off and the splines are all fine, and if it wasn't I'd have higher RPM and less propulsion right? I will check compression, and now I'm wondering... maybe I should adjust valve clearances? Thank you for the reply.
  6. I

    '05 Johnson 30 hp 4-stroke Loses Power

    I would agree that water is a likely culprit, but I think I've ruled that out, unless it's getting in somewhere else.
  7. I

    '05 Johnson 30 hp 4-stroke Loses Power

    Hello, Model J30TEL4SD Ser. S 20026107 Built 7/2005 Starts great, idles great, but will suddenly lose RPM and power. Rarely runs perfect with all the power, most times seems like 9.9 hp instead of 30. Still runs smooth, not missing or cutting out, just pokey. Will do it with just me in the...
See more
Back
Top