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  1. jimmbo

    Wide open throttle timing

    Besides posting this in the wrong Forum(I sent a note to the Moderators to move it), You have not provided any Info as to what Engine is involved. What Service Manual are you using to guide you thus far?
  2. jimmbo

    Johnson stops dead!

    No, those engines were design to last over 1000 hrs at WOT. Back in those days, if you tried that with an Automotive/Truck Engine, it wouldn't make it 300hrs.
  3. jimmbo

    Johnson stops dead!

    Try running it with the Gas Cap on the Tank, loose
  4. jimmbo

    Need a CDI for a 1979 to 1983 120HP mercury outboard

    I too have Never heard of a 120 Hp Mercury Outboard from that, or any other Era
  5. jimmbo

    AMS Oil 75W90 or Evinrude Lower Unit Gear Oil

    As mentioned a Marine Grade Gear Oil will be fine, as the unit is not a Hypoid Gear design.
  6. jimmbo

    Evinrude 10HP 1964 motor needs skeg repair or replacement.

    Hey Racer, you coming out to Burnstick Lake this Year?
  7. jimmbo

    Evinrude 10HP 1964 motor needs skeg repair or replacement.

    One of my OMC Prop Charts shows a 10HP in 51, using the same Prop #s as the 56-63s
  8. jimmbo

    Going from 25 hp to 35 hp

    Not in the Public Forums.
  9. jimmbo

    Evinrude 10HP 1964 motor needs skeg repair or replacement.

    There was no 10 HP in 64, that was the yr the 9 1/2 was introduced. Your 10 was made between 1951 and 1963
  10. jimmbo

    1957 Johnson Rd-19 35hp questions

    When You do the Compression Test, unless you are using the Electric Starter, you will have to disable the Compression Relief Mechanism If you mean Generic Brands of Marine Gear Oil, you should be Okay. However I wouldn't recommend Auto Gear Oil.
  11. jimmbo

    1957 Johnson Rd-19 35hp questions

    Marine Gear Oil will be fine. Mercury and BRP market good ones.
  12. jimmbo

    1957 Johnson Rd-19 35hp questions

    This might help http://www.fiberglassics.com/library/images/e/ea/Johnsonservice002.pdf
  13. jimmbo

    89 Mercury Classic 50 won’t open up

    Sounds like Shorts, and Internal Breaks in some Wires
  14. jimmbo

    1957 Johnson Rd-19 35hp questions

    35hp @4500 rpm WOT Range 4000-5000 rpm 21:12 Gear Ratio Point Gap 0.020" Plug Gap 0:030" Spark Plug. J6J was the Specified Plug, but as to what has Superseded that Number I don't know Being that is almost 70 yrs old, what condition were the Ignition Coils? Edit: I actually have the Owners...
  15. jimmbo

    50hp Johnson 2 stroke prop

    That is wonderful, but in reality tells me Squat... Yr of Engine WOT Rpm range of that Engine What WOT Rpm you are currently getting Make and and Model of the Current Prop are some of the Info that is REQUIRED, before any Objective and Accurate Propping Advice can be given.
  16. jimmbo

    50hp Johnson 2 stroke prop

    Welcome to iboats 30-33 mph on an 18ft Boat with a 50hp, is actually very good. Now without more info, it is a Waste of Time to give any Recommendation https://forums.iboats.com/threads/read-this-first.282907/
  17. jimmbo

    Going from 25 hp to 35 hp

    Can the Spark jump a 3/8" Gap on both Cylinder? Have you ever disconnect one of the Plugs and see how the engine runs under Load, then tried it with the other unhooked? Is there any signs of Oil-Fuel running down from the top of the Block? Is the Carb opening Fully? How long have you owned this...
  18. jimmbo

    Bogging at full throttle intermittently

    Welcome to iboats Might be a Fuel Starvation issue, That last 20% of the Throttle Lever Arc, really increases the Demand for Fuel. You say you replaced the Fuel Lines. does that include the Lines between the Connector to the Pump, and from the Pump to the Carb(s)? When you have the issue, have...
  19. jimmbo

    Prop size?

    As long as the Boat isn't underpowered for its Weight, and Load, you should be fine. Edit: Is your engine a 2 Stroke or a 4 Stroke?
  20. jimmbo

    Why is my gas orange?

    Perhaps a very thick layer of Varnish in that Tank/Fuel Line, to be able to overpower the Blue Dye in the Oil. While Lacquer Thinner is good at dissolving Gum and Varnish, it might reck havoc on the O-rings located in the Tank Disconnect, so some Caution, maybe removal of the Pickup-Float-Gauge...
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