TOPIC: 1974 merc 85hp idiling issue

1974 merc 85hp idiling issue 15 years 11 months ago #4713

600micro0 Topic Author Offline Fresh Boarder Posts: 1 Thank you received: 0	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. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re: 1974 merc 85hp idiling issue 15 years 11 months ago #4727

professor Offline Gold Boarder Posts: 758 Karma: 87 Thank you received: 1	Always start the trouble shooting with a compression test. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re: 1974 merc 85hp idiling issue 15 years 11 months ago #4837

Alacrity
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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.

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Re: 1974 merc 85hp idiling issue 15 years 11 months ago #4861

dave bernard Offline Platinum Boarder Posts: 1471 Karma: 95 Thank you received: 30	have you cleaned the cap and rotor if it has one. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re: 1974 merc 85hp idiling issue 15 years 11 months ago #4870

g3jim Offline Platinum Boarder Posts: 1009 Karma: -27 Thank you received: 0	end cap seals?? especially the bottom seals Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re: 1974 merc 85hp idiling issue 15 years 11 months ago #4884

dave bernard Offline Platinum Boarder Posts: 1471 Karma: 95 Thank you received: 30	if lower seal was bad it would pull water in the lower cyl. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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