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  1. jimmbo

    mercury blackmax 150 power/wot problems

    Well, the OP had stated he had adjusted a "screw' to open the Carbs to get it to idle... A complete link and sync is gonna be needed.
  2. jimmbo

    mercury blackmax 150 power/wot problems

    While the the Idle Timing is what determines the Idle Speed, there is a Specific Screw on the Throttle Linkage that is used for that purpose. Messing with the other screws will likely Eff things up. Throttle Cable Length will also need Adjusting after the Correct Screw is adjusted.
  3. jimmbo

    Is my trailer too short?

    Being that the Bunks are unsupported after the Mount, really isn't much different than just hanging the Transom past the Bunks. On one of my Trailers I installed the Hardware EZ Loader used on a lot of their Trailers to support the Bunks. This Trailer had the Supports at the Transom as OEM, but...
  4. jimmbo

    85hp charger speed/prop/rpm concerns

    $250... That is Pocket Change for a Prop, all 3 of mine have a List Price of over a Grand each
  5. jimmbo

    1939 Evinrude fuel question

    I thought it might be an Evinrude, but the OP said Johnson, in the Post
  6. jimmbo

    Water test on 115 HO etec

    The Pitch Values are picked by that particular Manufacturer. Some Props are even offered in One Inch changes. Props can be Tweaked, but results will vary by what is Done, and also by how Competent the Tweaker is. Taking off with the Engine at higher Heights does offer a big chance of...
  7. jimmbo

    1939 Evinrude fuel question

    Have fun with that engine, just make sure to put enough Oil in the Gas. 16:1 or 12:1. Hopefully there is some indication on the Fuel Tank Johnson Service Manual doesn't show a 1.8hp in 1939. Actually it doesn't show a 1.8hp in any Year Do you have a Model #?
  8. jimmbo

    Intermittent spark on 1976 35 HP Evinrude

    Neat what a bit of Troubleshooting/Inspection can reveal...
  9. jimmbo

    Water test on 115 HO etec

    You need to have the Rpm #s that are attained running at WOT, in the Configuration it will be running. It makes no sense to prop it for say, 6000(or what ever the Number you need), with the Motor lowered fully, then go screaming down the Lake with the Engine Jacked up. It also goes the other...
  10. jimmbo

    Water test on 115 HO etec

    I would prefer Real Numbers, not Beliefs... Find out.
  11. jimmbo

    85hp charger speed/prop/rpm concerns

    If there is a Cup on either of them, it is pretty much invisible
  12. jimmbo

    1969 85hp starflite, low power and cutting in and out

    This thread is already 50 posts long, so all you have to say to racer's request is that it was done, and the Results. He is one of the best on this Board when it comes to Motors of that Era.
  13. jimmbo

    85hp charger speed/prop/rpm concerns

    Unless you are exceeding 45 most of the Time, Normal Duty is probably the Best Choice for your Boat, but you might have to even put it a 1/2" below the Hull.
  14. jimmbo

    Water test on 115 HO etec

    And what is the Manufacturer's WOT Rpm Range?
  15. jimmbo

    1969 85hp starflite, low power and cutting in and out

    Well, as mentioned, Heat can reck Havok on Electronics, regardless of Vintage. It looks like it is mounted on a Heatsink... Is there supposed to be a Thermal Paste between the 2? If you have ruled out all the other Components as being the Problem, and all Connections are Electrically Secure...
  16. jimmbo

    Intermittent spark on 1976 35 HP Evinrude

    Well it is 48 yrs old, maybe when Armature Plate is moving the Plug Wires are Flexing and the Internal Resistance rises, or the Insulation is weak, and the Spark doesn't make it to the Plug
  17. jimmbo

    85hp charger speed/prop/rpm concerns

    Being that the Props you are using appear to have little or no Cup, there a very good chance that having the Engine at that Height, is the reason you are experiencing the Prop losing its bite.
  18. jimmbo

    85hp charger speed/prop/rpm concerns

    Looking at the Pics, I see little, if any Cup, on those Blades. Cupping help the Prop's ability to keep a Grip on the Water if there the Water is not Solid, as in Undisturbed. Where is the Anti-Ventilation Plate, with regard to the Hull Bottom height wise, when it is Parallel to the Keel?
  19. jimmbo

    1969 85hp starflite, low power and cutting in and out

    Okay you verified Spark on One Cylinder, there are 3 others, of which, some components are shared, and others are specific to each Cylinder. That Engine is far older than any of the Engineers ever planned/expected it to last. Heat can play Havoc with Electronics, especially 55 yr old...
  20. jimmbo

    Water test on 115 HO etec

    It is Autumn, and if you prop it Now, or early Spring, you might discover it will lose some Power and Rpms come Summer. Something to keep in Mind.
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