keithb7's latest activity

  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    Well here it is, the spark easily jumping a ¾” gap. I’m laughing at this point. It’s becoming comical. I really thought we were onto...
    • IMG_2152.jpeg
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    @Nordin I think you are on to something there. Under compression the spark may not be firing. What you say makes sense and is possible...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    The Ignition system looks ample to me. I need to comfirm it’s occuring at the right time. These engines are pretty basic, fool proof...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    Reviewing my outboard technical textbooks there are 8 different Mercury ignition systems that they used. You pretty-well need to be an...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    Tried swapping the spark plug coil wire positions. No improvement. Also coils (2 qty) tested in spec. Flywheel keyway is in place. As...
    • IMG_2137.jpeg
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    Are you using the Choke? Yes. With or without the choke. Made no difference. If I remember, the Fuel Pump is integral to the Carb, and...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    I just studied my Mercury shop manual here again to confirm. There are no published tolerances for piston clearance. No compression...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    To clean the piston grooves I broke off a piece of the removed piston rings. I used it to scrape out any carbon. Honestly the engine...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    I used a 3 finger, sprung, straight-style home. I performed a quick hone. Not over-doing it. The carb float was set as per factory...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    Someone told me they were low compression. I am doubting that. I have since seen folks on-line measuring 110 psi. The break-in exercise...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    I spent 2.5 hours out on the water today. Breaking-in the engine. When I got home I measured 75 psi still. Seems odd to me after a light...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    Thanks for your responses folks. I feel like I solved it. It was indeed low compression. I lightly honed the cylinders and installed...
  • K
    keithb7 replied to the thread Stubborn To Start 1979 9.8.
    The issue appears to be compression. I put oil in the cylinders and raised compression to 110 psi. She’ll run. I’ll see if seating the...
  • K
    keithb7 posted the thread Stubborn To Start 1979 9.8 in Mercury & Mariner Outboards.
    Affer a powerhead refresh, my 9.8 won't start unless I squirt some raw fuel into the carb intake. Then it'll fire up first pull, sound...
  • K
    keithb7 replied to the thread My 1979 9.8 Project.
    With the weather improving weekly, I look forward to getting out and testing my Merc rebuilds. I’m curious about the HP rating at the...
Show older items
Top