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  1. jimmbo

    72 Mercury 500 No Spark

    On the port side is the exhaust cover. You really don't want to try removing that. On average more than 1/2 the Bolts break when there are attempts to remove them.
  2. jimmbo

    72 Mercury 500 No Spark

    Remove that water jacket cover and this is what you will see. That engine does not have a removable Cylinder head
  3. jimmbo

    Mercury 150 not performing well under load and drinking gas.

    The nuts that hold the carbs on look like they have been wrenched on many times, so I suspect the High Fuel burn has been an ongoing issue for while. As the powerhead has been changed, and apparently from a 200 to a 150, makes for some Questions. Was the complete Powerhead swapped, carbs and...
  4. jimmbo

    Thrust to Hull

    Welcome to iboats Well, it depends on what kind of an Inboard it was. An old style Inboard, where the Prop Shaft runs through the Keel of the Boat, the Thrust would be transferred through to the Engine Mounts. An I/O, that would depend on the Brand, and the Year of the Engine. Some like the...
  5. jimmbo

    72 Mercury 500 No Spark

    That is a difference greater than 15%.
  6. jimmbo

    Mercury 150 not performing well under load and drinking gas.

    Oh oh, we might have a FrankinMerc, or one where a previous owner stuck a 150 Cowl on to hide a 200, from casual inspection(some States get really goofy about Overpowering), or to have the fastest 150 on the lake, likely both
  7. jimmbo

    72 Mercury 500 No Spark

    You're Correct, the 72 was 3 cylinder. I have the 72 Brochure on the shelf next to my desk. Damn it you caught me again;) The 3s never were in the top 10, unless you are referring to Poor Running/Performance.
  8. jimmbo

    72 Mercury 500 No Spark

    The 69s, had the nicest Cowl Decal that Mercury ever had If the Lower unit came off of a 4 cylinder 65hp, 75hp, 80hp or 85hp, it will have the proper gear ratio for any of those engines. Hopefully the shaft lengths match and are correct for you boat Myself, I like the post 78 cases better...
  9. jimmbo

    Mercury 150 not performing well under load and drinking gas.

    Motors always ran/run great till they don't. Well since parts are described as things, and neither you or your friend appear to be familiar with these engines, and what makes them tick. I suggest you don't go near them with tools that can adjust things. Assuming things has lead to many of these...
  10. jimmbo

    Mercury 150 not performing well under load and drinking gas.

    Carbs are part of it, so is Spark Advance. It the timing advancing as the throttle lever is pushed? Is the Primary Pickup Timing Correct? Its the Max Advance set correctly Back to the carbs, are all fully closed at Idle? Are the floats set properly? Are the idle mixture screws(if the carbs have...
  11. jimmbo

    Rapid trailer jerk at higher speeds

    My fence was last replaced in 1984, it is still up. Cedar
  12. jimmbo

    Just thought I'd share a nice photo.

    They sure don't make em like they used to. Thank Goodness
  13. jimmbo

    1994 40hp Mercury

    Your other thread on this engine was moved to the Force/Chrysler section
  14. jimmbo

    Quick hub question

    That extra Blade will likely kill the Top Speed. What rpms were you getting with old props?
  15. jimmbo

    Rapid trailer jerk at higher speeds

    Since it is fine with other Tow Vehicles, the trailer is likely in the clear I don't pay attention to, or have any knowledge of 99% of the Vehicles made/sold. This Buick, is it FWD, RWD, AWD...?
  16. jimmbo

    Picture of my prop - what’s going on here?

    Likely just a Distortion from the Camera/Lens/Perspective, even Post Processing of the Image.
  17. jimmbo

    How to remove old gas from main tank of my 1989 I/O

  18. jimmbo

    How to remove old gas from main tank of my 1989 I/O

    I cheated. I went to my dealer, and borrowed the device they use when prepping Boats for Storage, It was just an Electric Fuel Pump, with a couple of Hoses with barbs. I unhooked the Fuel line just prior to the Engines Fuel Pump, connected the Dealers thingy, put the other end in one of my cars...
  19. jimmbo

    Glastron SX 175 Gas Smell

    I assumed the SX175 had a Rear Bench Seat, like the 195. Does yours have a Bench seat or a Engine Cover and a couple jump seats that only kids van sit in?
  20. jimmbo

    Caprice Shudder at Hwy Speed

    In 1988 I had a 1981 Olds 98 with about 235,000 on it, and the front end was shot, so I took it to a shop, and they did the Inspection and said Ball Joints, Tie Rods, Idler Arm. I said put them, in. About 9 months later, I was back there to remove the Catalytic Converter. Before that happened, I...
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