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  1. jimmbo

    40hp Dead Top Cylinder

    Is Fuel getting into the Carb Bowl? Is the Fuel getting through the Circuits within the Carb? Correct Gaskets used inside the Carb, which have all Fuel and Air Circuit Passages open? Keep in Mind, we can not see, hear, or touch your motor. We can only go by what info you are telling us...
  2. jimmbo

    40hp Dead Top Cylinder

    That right there is significant. Your Hand should be remain Dry, as any Fuel should be entering the Engine, not being pushed out the front of the Carb. Check the Reed Valves
  3. jimmbo

    1987 40hp evinrude vro (oil deleted) carb issue?

    Looking at the Parts Book for an 87 40hp, you cannot adjust the Idle Mix on the Carbs, as they have a Fixed Jet. So either your engine in an 87, or the Carbs are from something else... With a Fixed Jet Carb, any Lean Condition would imply Air Leaks, Low Fuel Level, Restrictions in the Fuel...
  4. jimmbo

    prop question

    The High 5.... It is of course a 5 blade. The Blades certainly are Smaller as there are more of them, and the Diameter of the Prop is smaller than 3 and 4 blade Props. The Blades do have some Rake, and a Progressive Pitch. Being a smaller Diameter, also means the Engine, can be mounted Higher on...
  5. jimmbo

    Engine wont Start

    Does it have Spark? Strong enough to jump a 7/16" gap? Have you done a Compression Test?
  6. jimmbo

    Johnson 20 hp. Carburetor problem

    Is this 'Lucas Oil' a TCW-3 Oil? Why are you adding SeaFoam to the Gas, there are much better Snake Oils you can use? As for the Oil you see on the Gearcase, have you smelled it? If it smells like Gas. it is likely unburnt Gas and Oil, but it reeks to High Heaven, it would likely be Gear Oil...
  7. jimmbo

    prop question

    If you have several Props, say 10, different makes or even models, but with the same Dia and Pitch, you can very well end up with 10 different outcomes. Other differences, such as Rake, Cupping, Blade Shape, Blade Area, between the Props will cause those differences.
  8. jimmbo

    prop question

    Dropping Pitch and keeping 3 blades will improve the Holeshot, adding a Blade would also put more load on the Engine, likely killing Holeshot, unless the pitch is dropped even more
  9. jimmbo

    prop question

    Personally, I avoid 4 and 5 blade Props like the Plague, as they kill the Top End because of all the extra Drag, and that Drag is greater at all speeds so your Fuel Mileage takes a hit also
  10. jimmbo

    Hard plane after switch from points ignition

    Do you know what the Original Distributor had for an Advance Curve? You should be able to get that info from a Factory Manual
  11. jimmbo

    40hp Dead Top Cylinder

    In the mid 50s the biggest OMC 2 strokes had a 5:1 Compression Ratio, upped to 5.5:1 in 56 or 57/ 14.7lbs/sq in with 5:1 would yield less than 75psi, and they ran
  12. jimmbo

    1987 40hp evinrude vro (oil deleted) carb issue?

    Get a couple of Carb Rebuild Kits, and clean them, Properly, and then rebuild them. taking the time to ensure the Float is set right, and that all needed Gaskets are used As for the chip in the carb body on the Throttle Shaft, while you have it off spray some carb cleaner on the Shaft and see...
  13. jimmbo

    40hp Dead Top Cylinder

    I'm not going to reread everything, but can the Ignition System produce a Spark that can Jump a 3/8" gap. I know you said you used a Spark Tester, but those range from Good to less than Useless An Engine requires 3 basic things to Run. 1) Fuel and Air delivered to the Combustion Chamber 2)...
  14. jimmbo

    1987 40hp evinrude vro (oil deleted) carb issue?

    A lot of Idle and Off Idle Problems are because of Gum/Varnish/Dirt under #5, soaking just lets more of the above settle in there. The Disk has to be removed, the chamber cleaned, and a new disk installed.
  15. jimmbo

    prop question

    Turning Point, IMHO, has had very poor QC in the past. I remember opening several Boxes, and finding one of the Blades, not the Same as as the Others. Stick with Mercury/Quicksilver. As for which Pitch, it would have been nice to know what rpm the 21 attained, so getting a new hub/insert would...
  16. jimmbo

    40hp Dead Top Cylinder

    You would likely be better off taking this one apart for Cleaning, and Adjustment, than buying another potential Set of Problems
  17. jimmbo

    40hp Dead Top Cylinder

    Just soaking carbs isn't going to get all the Gunk out of the Passages. That is why the OEM Carb Kits come with little Disks and Lead Balls. The matching ones on the Carb, have to be removed to gain Access to where Gum/Varnish/Dirt hide and cause issues.
  18. jimmbo

    Any saving the engine? I’m devastated

    Have Never heard of any Snake Oil named Kroll.
  19. jimmbo

    Anti-Ventilation Plate Height?

    I guess that could be a Motor and Prop for a Sailboat
  20. jimmbo

    Anti-Ventilation Plate Height?

    I will assume you have twin outboards, and the fact that you aren't running a Performance type Prop, in fact the Prop shown isn't either for that engine, or some adapters are missing. No it is not the correct height
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