Search results

  1. R

    1986 Mercury 75hp Mod.

    I had an old Evinrude Big Twin with home made " trumpet exhaust " ------One day I let a friend drive the boat.-------I could not believe the amount of noise coming out of that engine.----Was not that bad when you were in the boat.-----I took that set-up off the next day.-----Still have it...
  2. R

    82 johnson 140

    A leak down test measure air leakage out of the cylinder.----You put air pressure in through sparkplug hole.----You determine how much air needs to be added as air leaks out.-----On a 4 stroke air leaks past rings , valves and head gasket.----On a 2 stroke air leaks past rings or head gasket (...
  3. R

    1986 Mercury 75hp Mod.

    That used to be an 85 HP then changed to propshaft rating at 75 HP.
  4. R

    82 johnson 140

    The failure occurs in # 1 , 2 , 3 and # 4.----Come over and I can show you numerous examples !-----In my opinion it is the design of the piston ring.----Draw a picture of the upper ring in its groove.------Then draw the picture again , adding clearances in a worn cylinder , worn ring , worn...
  5. R

    Tohatsu 9.8 HP Revival.-

    I believe you mis-understand the concept of this vacuum gauge.----It works on 4 stroke motors.----It is not used on 2 stroke motors !!
  6. R

    Optimax Rebuild

    One caution for you.-----You have to determine why the failure occurred !!----Or you will / might have to rebuild again soon after you fire it up.------You must check the ECU and sensors.------Myself I would not rebuild one of those motors !!
  7. R

    150 gt popping when cold

    Sorry -----As stated this --" lean sneeze " -----Is not well understood.-----It has nothing to do with the starting ability of the motor.----There are other things to be concerned about on that motor.----You have installed a new water pump impeller ?----Done a compression test for future...
  8. R

    150 gt popping when cold

    Many 2 stroke behave like this when cold.------It is called ---" lean sneeze "-----And it is not a well understood concept as you will find in your searching for a fix.
  9. R

    Tohatsu 9.8 HP Revival.-

    The video shows the gauge used on a ----4 stroke motor------Hard to use that unit on a 2 stroke !!!-----It seems some folks insist that this procedure can be / should be done on a 2 stroke.----I do not know why that is so !
  10. R

    Stuck at MAX revs 2000 50HP Johnson

    Checked flywheel key ?--
  11. R

    Star Board are running hot

    Sorry----I do not know what----" much hotter " ----Means here.-----The coils / wires are on correct for the 2 & 4 cylinders ?----What happens when you pull #2 plug wire off at idle.----What happens when you pull #4 off at idle ?
  12. R

    60 DEGREE vapor seperator function?

    I do not believe the carbureted 60 degree motors have a ---" fuel return system "--- at all.-----And the wee vapor pump just pulls vapor off the separator tank and puts it into the intake manifold.----The factory manual has a nice diagram with all components , hoses.----Shows how and where fuel...
  13. R

    carberator adjustment on 2007 15 hp 2 stroke

    Many outboards do not get a lot of use.---Winter , snow and ice are one reason here.----Just took apart a 1965 model Evinrude 6 HP.----Pistons measure original size.-----Rings still showed factory machining marking.----Barely broken in !!-----Trouble shooting should be done before deciding on...
  14. R

    Where to get decent, unbiased info about new outboard choices?

    The 1990 model 30 HP is a proven reliable motor.------Built basically the same from 1976 to 2005 I think.---So lots of used parts around.-----I would fix the issues with it and add electric start.----Find a $150 donor motor with every thing you need.
  15. R

    60 DEGREE vapor seperator function?

    I think the motors with carburetors have the vapor separator too.
  16. R

    carberator adjustment on 2007 15 hp 2 stroke

    Everybody picks on the carburetor it seems.----Did this rough running show up suddenly ? --What other trouble shooting has been done if any.----Carburetors do not suddenly go out of adjustment I say.
  17. R

    150 gt popping when cold

    Well----" everything rebuilt " ---can mean a lot of things.----Any more details ?
  18. R

    Intermittent "cough" during startup.

    When piston is at the bottom of the stroke the crankcase ( with fresh fuel ) is the OPEN to the exhaust and any fire in the exhaust manifold.
  19. R

    Mercury 500 Strange Ignition Problem?

    You say you have spark that jumps a gap of 1/2" on all coils.----That would make me think coils are all OK.----Remove bypass covers to look at pistons / rings on this motor.-----Or take boat for a spin with timing light hooked up to one lead at a time.---Observe the flashing light and look for...
  20. R

    Derating a 5 hp ( ca, 1995 model) to 4 hp

    Folks are confused about boats and motors etc , etc.----I remember the insurance agent asking me how fast my 30' sailboat could go with the motor. .----I said with the right conditions the sails could push it at double the speed of the motor.----Nothing but an amazed look from the agent.----Yes...
Top