Search results

  1. C

    Hose connection in transom well?

    Likely for raw water washdown. Look for a thru hull fitting which would route the water to the pump.
  2. C

    Parts availiability ??

    Your rant is an old wives' tale. Champion Spark Plugs were and are good spark plugs. They have been a leading brand forever. The 50's and newer Johnnyrudes specified them 70's and later Mercs specified them as well. even today, as such, Johnnyrude owners swear by them. I have found no...
  3. C

    Trim tab removal on a 1970s(?) Merc 500 Thunderbolt 50hp

    Crap, the zinc is much softer. Destroy the zinc anode and replace the bolt. Drill a few holes in the zinc and break it off with a chistle. Older Mercs often had hex head bolts there. Sometimes you needed a specific thin wall 3/8" drive socket to get to 'em. The right size socket would just...
  4. C

    Parts availiability ??

    The Champion L-78V was the original plug specified by mercury in the early 70s (or earlier) for some of their IL engines. It was superseded by the BUHW-2. The L-78V still looks to be available. You could also likely use the Champion L-76V, as it is real close to the BUHW-2. There was also a...
  5. C

    1986 115hp inline 6

    The carbs can have unique idle mixture settings. usually, the top carb is the most open, followed by the mid carb. However, you need to use trial and error (and a friend is nice), to set them properly.
  6. C

    1986 115hp inline 6

    Unlikely your issue is reed valves. Your carbs are all cleaned and rebuilt with new gaskets, inlet needles, seats and floats? Your ign timing is spot on? You are adjusting the carbs in the water, in gear with fresh 50::1 fuel mix? Those things are necessary. A leaking fuel pump diaphragm...
  7. C

    Throttle shaft

    Once you synch the carb opening and ign timing, set the idle speed to whatever runs slow and smooth.
  8. C

    Universal control cable

    See what control cables Yamaha recommends for your model of motor. Merc and Johnnyrude are quite different, I would therefore expect Yammies to have their own. Heck, even their gearcase plugs are different than merc and Johnnyrude.
  9. C

    Boat motor problems

    When you say it stops when cranking, do you mean it stops cranking, but you hear the starter still spinning? If so, the motor fires once, and kicks out the bendix. Not unusual. Try choking the motor more. So, pump up the primer bulb until hard, cold start lever up, choke button down (or...
  10. C

    Throttle shaft

    Both symptoms point to an overflowing carb. Make sure the carb float is set correctly. Replacement of the carb inlet needle valve and seat is a maintenance item, as is replacement of the float. Also, the motors in the 70's had foam floats that dissolved in today's alcohol fuel mix. Those foam...
  11. C

    Ignition upgrade for a 1979 Chrysler 20hp 202H9K

    A backfire means that the ign system is working. Why do you want to change it to a CDI unit? Generally, it is hard to upgrade ot a CDI unit, and unnecessary. However, in the 70s, we had points/coil ign on our car. However, my father installed a CDI unit that was wired between the battery and...
  12. C

    Uprgrading outboard

    Of course, a better question is why you want 1/2 the HP you now have?
  13. C

    Uprgrading outboard

    Hydraulics will change over. The throttle cables and controls will work. The only question is the electronics of the control. What years are the two motors in question.
  14. C

    rub rail

    A picture is worth 1000 words.
  15. C

    Evinrude J90PLEED carb rebuild issues hi speed

    Does it hold high RPM or does it vary at wide open throttle? After carb rebuild, did you check the throttle movement to see that the carbs do open all the way? How much speed was lost? Are all cylinders firing?
  16. C

    Re-wiring my 78 mercury tower of power

    You could graft the old wiring to a new control box, however, from your description the quick disconnect plug is bad/getting bad, so that does not solve the issue. A new control for $150 or so will come with a new boat harness and a round plug, different from what you have now, but the wire...
  17. C

    Looking at 1991 Johnson 200 any tips?

    That motor will be a multi carb, 2 cycle engine with or without oil injection. When maintained they are pretty good. However as was said, you will likely need to do your own maintenance and repair, as shops will be reticent to work on them. Compression and gearcase health are the two most...
  18. C

    Can I wire a electric choke switch

    On a related issue. Not sure what year your motor is, but the 80s and 70s Merc engine wiring harnesses tend to go bad after this much time. Look for insulation falling off the wires. New engine harnesses are avail after market for most motors. Heck, your choke wire could be broken at the...
  19. C

    Can I wire a electric choke switch

    You did not mention the age of the MerControl. The MerControl wiring I had on my motors since 1978 lasted up until a year ago. At that point the wiring was pretty bad throughout the control, but the mechanicals were fine. I had extra wire in the boat harness, so I cut away the bad stuff and...
  20. C

    Can I wire a electric choke switch

    If you do end up replacing the ignition switch, take the existing one and make sure to match its size. Those MerControls do not have a lot of extra room in them. It is likely that a Mercury OB dealer can get one for you.
Top