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  1. jimmbo

    Everything done but low rpm at WOT. Distributor spring?

    I'm not rereading everything, but is the Spark advancing and to the proper Max Advance? Has been any changes to the Engine that you are aware of, such as Camshaft, Heads, Pistons? Has the Timing Chain and Sprockets been changed? Harmonic Balancer? How long have you had this boat and motor, and...
  2. jimmbo

    Missing transom bolt on Mercruser outdrive to bellhousing.

    You might be able to order it online from a couple of places. Marine Engine dot com, is one
  3. jimmbo

    1979 Glastron T166 XL Sportster Bilge Holes?

    Water is/has gotten in there, be happy it has a way of getting out. You are going to have check the Hull, and anywhere where water could be splashing up along where the Hull and the Cap are joined. A 44 yr old Boat is liable to have a few leaks
  4. jimmbo

    Missing transom bolt on Mercruser outdrive to bellhousing.

    Which Bolt are you referring to, on what Outdrive? You could look up a Parts Diagram for the Outdrive involved, and get the Part Number
  5. jimmbo

    High compression in 1 cylinder - 7.4 carb

    Marine, RV/Truck are not the same Cams. Most trucks just use the regular Auto Engine so no "Truck Cam". RV cams, are still different than a Marine Grind. "Close" is really only Valid, with Horseshoes, Grenades, and Nuclear Weapons. If you need a Cam, get one from Mercrusier, a few extra bucks...
  6. jimmbo

    over fueling at idle

    If the Injector isn't closing completely, it will drip. A can of Miracle Elixir might remove any deposits on the Pintle, but replacement is usually the fix.
  7. jimmbo

    over fueling at idle

    I suspect that once the engine has warmed up, that ice melts and proper Airflow resumes
  8. jimmbo

    over fueling at idle

    Okay the Injectors are higher up than I realized. That "looks like Frost" is exactly that, Ice. Humidity Levels must near 100% at the time
  9. jimmbo

    Everything done but low rpm at WOT. Distributor spring?

    Means no Restriction in the Airflow, which means the Carb is not too small.
  10. jimmbo

    over fueling at idle

    If it was a Carb, it would be easy to diagnose, EFI on the other hand, is the worst of Voodoo and Black Magic. If the engine is a 98, I doubt it would have O2 sensors, so it doesn't run a in a Closed Loop, but just uses basic things like Ambient and Engine Temps to adjust the AF ratio. Being...
  11. jimmbo

    1986 90hp johnson primer bulb collapsing..hear me out

    If the`Primer Bulb is collapsing, then there an Restriction, in the Fuel Line, Fuel Pickup, Pickup Strainer, or in the Tank's Ventilation. Loosening of the Filler Cap, can verify/rule out Tank Ventilation.
  12. jimmbo

    Might this work as a backup?

    I would say 5900 as closer to Optimal. What are you currently getting at WOT?
  13. jimmbo

    How to find pitch and diameter of a stainless steel prop and is it left or right

    That is an OMC SS prop. It looks like it has been repaired a few times, based on all the Numbers Stamped on the Hub It is, or was, a 389948 13 3/8 X 17 SST II
  14. jimmbo

    Might this work as a backup?

    Let the Prop Engineers worry about Diameter. However, you do need to know the WOT Range for your engine, and chose a Prop that allows it to run within that Rpm range at WOT, preferably in the upper half. That said, there will be many props with identical/similar Diameter and Pitches, yet will...
  15. jimmbo

    Broken Skeg

    Are there any Prop Rebuilders nearby. They often do a booming Skeg Repair Business in addition to Prop Repair...
  16. jimmbo

    High compression in 1 cylinder - 7.4 carb

    Yup
  17. jimmbo

    Outboard in the Lake

    Points and Condensers are under the Flywheel
  18. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    If it is the Neutral interlock, you can bypass it, but then you have manually insure the motor is in Neutral, and not in gear at Full Throttle, when you go to start it.
  19. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    As racer said, Neutral Safety Switch(es) could be the Culprit, You might need to take the Control Box apart.
  20. jimmbo

    High compression in 1 cylinder - 7.4 carb

    Pull the Lifter out and examine it. 999 out of a Thousand you can determine if the a Cam Lobe is wiped just by looking the Lifter. . If the Lifter is collapsed, I would try taking it apart, freeing it up, cleaning it and reassembling it and putting it back, as putting a new Lifter onto a used...
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