Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1

TOPIC: 1974 merc 85hp idiling issue

1974 merc 85hp idiling issue 8 years 1 month ago #4713

I just aquired a 1974 85 hp merc outboard it runs fine on fast idle,but will not slow idle.can someone please provide some ideas of what could be wrong.

Please Log in to join the conversation.

Re: 1974 merc 85hp idiling issue 8 years 1 month ago #4727

Always start the trouble shooting with a compression test.

Please Log in to join the conversation.

Re: 1974 merc 85hp idiling issue 8 years 1 month ago #4837

As mentioned, check compressions are all good then go through the carbs & fuel pump. Check timing is correct. If all this is good then there are some small plastic restrictors located in the transfer ports on cylinders 1-3. By all accounts these can work free & get ingested, after that the thing will never idle any sense.

I believe I may have the restrictor issue on my '84 115 as it won't idle any sense & everything else is done.

Please Log in to join the conversation.

Re: 1974 merc 85hp idiling issue 8 years 1 month ago #4861

have you cleaned the cap and rotor if it has one.

Please Log in to join the conversation.

Re: 1974 merc 85hp idiling issue 8 years 1 month ago #4870

  • g3jim
  • g3jim's Avatar
  • Offline
  • Gold Boarder
  • Gold Boarder
  • Posts: 999
  • Karma: -27
  • Thank you received: 0
end cap seals?? especially the bottom seals

Please Log in to join the conversation.

Re: 1974 merc 85hp idiling issue 8 years 1 month ago #4884

if lower seal was bad it would pull water in the lower cyl.

Please Log in to join the conversation.

  • Page:
  • 1
Time to create page: 0.130 seconds

FG Login

Donate

Please consider supporting our efforts.

Glassified Ads

1958 Dorsett Belmont
( / Boats)

1958 Dorsett Belmont
05-22-2018

SEEKING: 1961 RED FISH aft side emblems.
( / Wanted)

noimage
05-22-2018

1956 Bell Boy 16' Hard Top Express
( / Boats)

1956 Bell Boy 16' Hard Top Express
05-14-2018

FiberGoogle

Quick Search

Who's Online

We have 1749 guests and 5 members online