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  1. jimmbo

    2000 70hp Johnson semi start/ won’t stay running

    When I said specific, I meant a Genuine OMC/BRP Service manual
  2. jimmbo

    2000 70hp Johnson semi start/ won’t stay running

    You need to get a Service Manual specific to that Model/Year of Motor
  3. jimmbo

    2000 70hp Johnson semi start/ won’t stay running

    After you remounted the carbs did you check/verify the Sync between the Carbs and Spark Timing? Also, how did you set the Idle speed? What Rpm is the Engine Idling at in gear, in the water? When you checked the spark, did you verify that it could jump a 3/8" gap on all cylinders?
  4. jimmbo

    97 Force 120- Low idle at times, stalls when engaging into gear

    What Rpm is the engine running at Idle, when in Gear? Maybe all it needs is a slight adjustment of the idle speed stop, though that is a bit more complicated than just turning a screw as it usually also requires adjusting the Throttle Cable length, so check out the things racer said above
  5. jimmbo

    No oil pressure after changing engine oil ?

    If the Filter refuses to allow Oil to pass, there should be a Bypass that lets the Oil Flow, unfiltered to prevent Immediate Engine Failure. My 5.7 ran for over 100 hrs before it sounded like it had Mechanical Lifters, due to the Oil Cooler Lines being reversed, and the Anti-Drainback Valve in...
  6. jimmbo

    Alpha drive for a V8 whats the ratio?

    I suspect the WOT Range for the Fuelie 5 liter, is 4800 - 5200 rpm. Mercury was placing that Info on the Flame Arrestor Decal
  7. jimmbo

    Embarrassing question

    Extra Oil will not repair any scoring/scuffing if it has happened. If the Fuel-Oil was diluted to 100:1, the engine should be okay, the 50:1 ratio is more Critical at High Load High RPM
  8. jimmbo

    Embarrassing question

    A Compression test only reveals issues with the Cylinder, Pistons and Rings. It can't indicate any Damage to the Crank, Connecting Rod, Piston Pin Bearings or to the Crankcase Sealing Rings. The Cylinder Walls actually require very little Lubrication.
  9. jimmbo

    Embarrassing question

    If, and that is a Big If, the tank had 20 gallons of 50:1 premix and you added 20 gallons, the result would be in theory 40 gallons of 100:1, but that would also assume complete mixing of the old and fresh gas... How much time running was even the slightest bit above Idle?
  10. jimmbo

    Embarrassing question

    How long ago did you buy this potential Anchor, and did the Dealer put in Writing it was a 4 stroke, and was there any Warranty? I'm not going to assume there any Oil in the Gas that was already in the tank, but how much fuel was in it, and how much did you add?
  11. jimmbo

    Embarrassing question

    How much is "not much" and at what throttle setting?
  12. jimmbo

    Embarrassing question

    You are saying you ran it without Oil added to the Gas? And the Dealer/Salesman said it was 4 stroke?
  13. jimmbo

    '87 mercury outboard 115hp 6cyl

    I knew it as FUBAR %$#&%$ up beyond all recognition
  14. jimmbo

    '87 mercury outboard 115hp 6cyl

    A 1987 motor would not have a Choke. It would have an Enrichment System that delivers some extra fuel to the crankcase to aid starting The control box of that era, had a button in at the Rotation Point of the Throttle Lever, that you pushed in to disengage the Gear Shift
  15. jimmbo

    Embarrassing question

    Welcome to iboats A late 70s engine would be Premix only. TCW-3 @50:1. I hope you haven't run it yet, without adding the Oil to the Gas
  16. jimmbo

    Carb Spacer

    I agree that rebuilding the original Carb is the better choice. When you buy a Remanufactured carb, it is difficult to know if it is actually has the correct Fuel Delivery Curve, or if it was originally the carb it is being resold as. There is more to a Fuel Delivery Curve than just which...
  17. jimmbo

    Outboard top cylinder getting hot

    Signs of bad Head Gasket? Low compression is one, Water the Cylinder is another, When you remove the Head, the gasket itself might reveal the failure, but the Head and Block can sometimes also reveal the leak. You will need to check the Head for Warpage, and should Lap it to ensure a flat...
  18. jimmbo

    Is my Mercruiser fuel injected or carb?

    Nor does it have a choke, accelerator pump or idle mixture screws, which are visible in the pics
  19. jimmbo

    1989 20 hp Johnson bearing carrier seals

    I will assume this non thru Prop Exhaust gearcase. Clearance for a Socket, most likely, and the contact area is Circular, not a Hexagon which could chew up the housing. Years ago they used Screws, not Bolts, but the thread was the same
  20. jimmbo

    No spark

    Welcome to iboats How did you determine that the Coil and Rectifier were bad? Here is wiring diagram for you engine, in case you don't have it.
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