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  1. Krsowles

    Looking for guidance please

    A quick update for some closure. I forgot to check compression but replaced the ignition module and stator under the flywheel with parts from my parts motor. I did that because when I put a spark plug tester in line to ignition coil, spark was very intermittent when condition started. After I...
  2. Krsowles

    Looking for guidance please

    I will check these things as soon as I can, thank you for suggestions!
  3. Krsowles

    Looking for guidance please

    I swapped in a good coil and no improvement. Can you suggest what else I might check on ignition? I’m sorry, my ignorance is showing 😬
  4. Krsowles

    Looking for guidance please

    Thank you for your reply! The motor only sits over winter. As soon as the ice leaves, it’s used 3-5 times a week. Full disclosure; it’s a 17.5 aluminum fish and ski boat and the 9.9 is the only motor on the boat. Most of my fishing is very close to my mooring and my wife and I live to just...
  5. Krsowles

    Looking for guidance please

    I have an 1997 Evinrude 9.9 4 stroke kicker that runs great for about 10-20 minutes and then starts to sputter and pop like timing is off. So far, I’ve tried pumping fuel and/or choking it and neither helped at all, maybe made worse. Pulled carb apart to look at and it was very clean so just...
  6. Krsowles

    Carb or worse?

    I have not run it long enough to know. Only on a hose changing oil (again) because some water got in. Maybe tomorrow night? I’m thinking I’ll put a thermostat back in. I still don’t know what caused the overheat, so a new one would’ve gone in anyways. Already did the impeller. I’ll let you...
  7. Krsowles

    Carb or worse?

    Thanks for your responses! Im curious about the thermostat, seems to me engineers put it there for a reason. My understanding it started as a car engine and was needed for heat in passenger area but doesn’t it also allow the engine itself to warm up quicker? That reduces threat of damage to...
  8. Krsowles

    Carb or worse?

    So I have what I hope to be a conclusion to my nightmare. I was pretty much conceded to replacing my motor. I found one locally for a good price and went to look at it. Turns out the guy selling it worked for years in the local boat shop until it was bought out and the new owners would not...
  9. Krsowles

    Carb or worse?

    Thanks Bondo, for the expertise! I’m leaning this way as a quick, short term remedy. Would allow me to possibly drop my 98 3.0 off at the engine shop and get it reworked properly. At that point I’m assuming it’ll be “like” a new motor going in, giving me years of trouble free service. That’s...
  10. Krsowles

    Carb or worse?

    Thanks Alldodge. I hate to give up on motor but I’m not sure I’ll really trust it 100% after this. In my limited experience, I feel like once the head has been done the owner continues to chase problems that arise from initial failure or problem. I believe the motor overheated from what I’ve...
  11. Krsowles

    Carb or worse?

    I’ve found a donor boat I may consider as a donor for a motor. I need to do more homework on the motor but I know it runs well and have seen a video of it running. My question is this; the motor in question is a 1988 3.0 Mercruiser and I have a 1998. I have read they may not exchange so...
  12. Krsowles

    Carb or worse?

    Alldodge, the spark seems strong. Good blue flame and regular.
  13. Krsowles

    Carb or worse?

    I have not tried fuel down the carb yet. Will bring some 50:1 with me next time down and try. I have not checked for water in tank. Before I started this process the motor would run, although horribly. You knew all cylinders weren’t firing, power non-existent and it became quite loud exhaust...
  14. Krsowles

    Carb or worse?

    So I loosened the valves today to just 0 valve lash after going back to TDC compression stroke. I tried turning it over and it really wanted to start. I tightened them 1/4 turn tried again and it still really wanted to start, about the same as just a 1/4 turn. Then I went to 3/4 turn (as...
  15. Krsowles

    Carb or worse?

    I agree, not good at all. If valves too tight, can’t that allow some pressure to escape and skew the numbers? I went over block every which way with flat bar(?) and feeler gauges and it wasn’t out much at all but I’m human… I want to loosen valves and try again.
  16. Krsowles

    Carb or worse?

    Alldodge, I’ve done some web scouring and am thinking it may be valves. Seems the most logical answer to why it acts as timing is off. I checked my compression and numbers weren’t great. 135,125, 170 and 120. I’m hoping the valve situation affecting those numbers some. I’m a little slammed...
  17. Krsowles

    Carb or worse?

    Thanks Bondo. I have a follow up then. Can the distributor get 180 degrees out if I never removed it? I also have the distributor wired 1-3-4-2, how it was when it was running. The spark arrestor has written on it 1-4-3-2. Can anyone set me definitively straight on the 98 Mercruiser 3.0...
  18. Krsowles

    Carb or worse?

    I have checked spark and fuel, both good. Timing hasn’t been touched except by valve lash adjustment.
  19. Krsowles

    Carb or worse?

    Update: had head flattened and reassembled motor, what fun! Torqued the head to 95 ft lbs, in 30 lb steps. 95 came from the Mercruiser bulletin 98-14 and plug gap set to .035. Adjusted valves at TDC, rotated one turn and then did the ones not done at TDC. Go to fire it and some times it...
  20. Krsowles

    Carb or worse?

    Thanks, alldodge. I don’t know if it overheated but I believe PO would’ve told me if he knew about it. That said, I don’t know. I’m guessing the crack from poor winterization and was hoping for a sequence of events from that, that would explain all this.
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