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  1. jimmbo

    Spark plugs for older Merc (80s)?

    Some people prefer warm engines, but if the engine won't start and run, it is not going to get warm. It rarely makes much difference, You keep cranking the engine, until the Gauge is at its highest reading. On multi cylinder Engines, there shouldn't be more than a 15% difference between the...
  2. jimmbo

    Merc Outboard - 2 Year Old Engine Failure, 5 Year Extended Warranty Denied

    A leaky head gasket, can put water on to the Spark Plug, and can also put enough water into the cylinder to hydro lock it. Perhaps you need to retain some Legal Council on this
  3. jimmbo

    Low Compression

    Welcome to iboats Try using a different Compression Gauge. How long have you owned this motor? Did it just start acting up? You could try spraying a couple cans of Power Tune into the Engine, to make sure the Rings are free How was it winterized?
  4. jimmbo

    175 2 stroke wont rev past 2k

    I used to have someone else drive the Boat, and with a air silencer off, shine a light down the carbs. You should be able to see fuel leaving the Main Nozzle. Wear Ear Protection, those thing are Loud. Dumping a bit of Premix into the carbs, when the problem is occurring might reveal a Lean Carb...
  5. jimmbo

    Mercruiser 5.7 won’t make power

    deleted I was going to ask if the Centrifugal Advance Weights were free to move, but it has an electronic Advance. However, is that working? How does the cam you picked compared to the Stock Mercrusier Cam? A lot of people figure they need a different Cam, thinking they are going to get gobs...
  6. jimmbo

    No Water - How Long?

    Don't know if this is what always happens but, you should replace it. An impeller, even a Pump Housing is Cheap compared to a powerhead A question though, How did you run the engine without noticing the Water was low?
  7. jimmbo

    1962 Merc 450 restoration ..

    It has threads
  8. jimmbo

    Spark plugs for older Merc (80s)?

    Wasn't that firm when? When you are squeezing it? When the engine is running?
  9. jimmbo

    MerCruiser 5.7L Low-ish Compression

    Just the potential of Downgrading both heads
  10. jimmbo

    175 2 stroke wont rev past 2k

    Are you getting a Spark that can jump a 3/8" gap on all cylinders? When were the carbs rebuilt the previous Season, beginning, halfway thru, during winterizing? Are all the carbs delivering Fuel thru the Main Circuit? You say you rerouted lines, which lines? The fuel Lines, or were you messing...
  11. jimmbo

    Leaking OMC Plastic Gas Tanks

    Welcome to iboats Does the tank look like this? Late 80s Or like this? Mid 90s
  12. jimmbo

    Caught another boats anchor, whos fault?

    Similar to the Dock Fisherman who casts his line in front of a Boat, then screams and yells when it gets cut. One time, I went back and said I wanted his Name, so I could send him the bill for the cost of replacing the Prop Shaft Seal. What I found the next day. Seal wasn't cut though
  13. jimmbo

    Mercury Switch

    The mercury switch you are likely referring to, is to kill the Ignition when the Gearcase lifts up out of the water when an Impact occurs with an underwater object
  14. jimmbo

    Mercury 175 wont shift

    Good. Keep applying ATF or other lube keep moving it to flush out any contaminates
  15. jimmbo

    Anyone Seen these?

    I gave him a Thumbs up, because what he said was Accurate and True. As for Comparing. How about against Conventional Props, of both the Same Pitch, but also against ones that provide the Best Performance, Best Efficiency for a given setup, instead of testing against Mismatched Props
  16. jimmbo

    25hp 3cylinder starting in reverse

    Get the correct Service Manual for your Engine. So when you shut the Engine off, is it in Neutral, Forward, then somehow it shifts, by itself into Reverse, before you restart it?
  17. jimmbo

    RPM at cranking speed

    It doesn't have to spin very fast, as even engines larger that that can be rope started. I used to rope start my 84 115 inline 6, as I was too cheap to replace the Battery, and it was an ADI system
  18. jimmbo

    Anyone Seen these?

    I never bashed the Prop. I bashed the Website that is just being a Informercial for it, and in over 2 yrs, has never been able to do an Apples to Apples Comparison of, or a credible Review of the Prop, instead just posts what the Maker, who is an Advertiser, tells them
  19. jimmbo

    Merc Outboard - 2 Year Old Engine Failure, 5 Year Extended Warranty Denied

    "The dealer found water on the bottom spark plug." Is there any Mention of water pouring out when Plug was removed? The cylinder should have been full at the point where the Piston stopped, and would have poured out as the plug was removed. A droplet or two on the plug is not conclusive proof of...
  20. jimmbo

    Now what

    There is a Rule of Thumb for recovered motors, Fresh Water, unless there is dirt and silt under the cowl, get it running within an hour or two, or expect to take it apart. If there is Silt, or it was Salt Water, the engine has to come apart for a proper cleaning. Waiting two days after recovery...
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