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  1. R

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

    But there is wonderful information available to you.----At a certain pressure-Flow through a 1" diameter hole is 4X that of the flow through a 1/2 " diameter hole.-----Nature does not always work the way you think it does !!
  2. R

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

    Do what you like.------Perhaps look at characteristics / calculations of airflow through a hole and engine performance.-----There must be some tutorials on google.
  3. R

    Compression test low on BF100 honda mid 80s

    I doubt there is compression release on these Honda outboards.
  4. R

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

    Would you need a " permit " to indicate modifications to your motor ?------Then just take a piece of shim stock and make a plate behind the carburetor to reduce air flow.----The hole at 2/3 diameter of what it is now will do it.
  5. R

    1995 90HP Force Outboard Fuel Starvation

    You could run with a timing light to observe spark as you increase throttle.-------I do know that a 20 PSI difference in a modern motor indicates a problem !!-------But in the big picture a head gasket is cheap.----Take the head off and have a look in there.
  6. R

    1995 90HP Force Outboard Fuel Starvation

    Some will argue -----Those compression numbers indicate a problem , like a scored piston.-----Pull cylinder head to have a look.----You have installed a new impeller in water pump ?
  7. R

    Performance question

    Run it on a ---Marine dynamometer-----That will check true engine power output.
  8. R

    Tell me about my 1980 70hp Evinrude E70elcsa

    It has power trim and tilt.-----In shallow water you can raise the motor to clear the bottom of the river / lake !!
  9. R

    Johnson 115 v4 60 degree

    Post compression values.----And does spark jump a gap of 3/8" (1 cm ) on all leads ?
  10. R

    Tell me about my 1980 70hp Evinrude E70elcsa

    Looks correct to me -----A long shaft motor on a 20" transom is what I see.
  11. R

    Tell me about my 1980 70hp Evinrude E70elcsa

    The " beep " on the turn of the key was a feature on newer control boxes.-----Find the tan coloured wire at the cylinder head.-----Slide rubber boot to expose knife connecter.----Turn key to on.-----Touch wire connecter to ground.----The horn should sound.
  12. R

    Tell me about my 1980 70hp Evinrude E70elcsa

    There should be a warning horn in the control box.---Best to test it now.-------If you do not know condition or age of water pump impeller you should install a new one.
  13. R

    Mercury 225 Offshore- LOSING MY MIND PLEASE HELP

    It has an ECU , crank position sensor and carburetors ??
  14. R

    Starter Solenoid?

    Some folks think that these things are all the same !----Proof that 12 volts and wires can be confusing.
  15. R

    1990’s Johnson/evinrude v4 similarities

    ??----You have to be clear with your questions / enquiry.-----There are different V-4 engines.-----The 90 degree crossflows.------The 60 degree loopers.----The 90 degree loopers.------While gears inside might be the same the driveshaft and shift rod may be different !!!-----The 60 degree looper...
  16. R

    Mercury 9.9 propshaft removal from bearing carrier

    The concept is quickly coming to marine engines too.-----Factories ( far away ) operate with robots and computers.-----Your local shop with high overhead can not compete with the factory in far away places.
  17. R

    Starter Solenoid?

    Not a factory part.----That makes posting advice difficult and adds confusion in most cases.
  18. R

    Leaking case halves/Crankcase

    As stated the sealer is supposed to squeeze out !!-----I assemble these with no primer.----Meticulous preparation.----Cleaning with laquer thinner.----Never use primer.----No problems either.
  19. R

    XR2 150HP won't rev past 3,000 RPM?

    Compression test first !!----Post the numbers.----Then look for strong spark on each lead.----These motor sound nice running on 3 of 6 cylinders.
  20. R

    Another Model year and HP thread

    My wildest guess is a 1996 model for the powerhead.----possible replacement ?
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