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'57 Merc Refresh 09 Jun 2020 15:11 #105062

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MercuryMarc wrote: Most of the Mark series and my Merc 400 require 6's "service Manual". Last spring I ran 8's and I would loose power near WOT. Ray and Merky suggest I try 6's. and my problem went away.


Good info thanks Marc! I have a new set of 6's in now as they were already in stock. An 8 would colder if remember correctly NGK's heat range is opposite. Lower number = hotter. In any case I'm thinking a combination of advance and fouled plugs is the issue. A test prop would be awesome but I think finding one is probably out the window.

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'57 Merc Refresh 09 Jun 2020 11:20 #105060

Most of the Mark series and my Merc 400 require 6's "service Manual". Last spring I ran 8's and I would loose power near WOT. Ray and Merky suggest I try 6's. and my problem went away.
Mercury Marc, 1958 Hawk II, Merc 400

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'57 Merc Refresh 09 Jun 2020 10:40 #105059

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Locomotion wrote: Are you sure about the heat range on the plugs, those look pretty cold.
Myself, I would stay with 25:1 for a bit longer and recheck the timing again before going back out.


They're NGK B6S and yes I could probably go a bit hotter.

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'57 Merc Refresh 09 Jun 2020 00:00 #105053

Are you sure about the heat range on the plugs, those look pretty cold.
Myself, I would stay with 25:1 for a bit longer and recheck the timing again before going back out.
“We delight in the beauty of the butterfly, but rarely admit the changes it has gone through to achieve that beauty.” Maya Angelou

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'57 Merc Refresh 08 Jun 2020 17:28 #105044

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2 hours run time at half throttle or less she ran pretty good. Once we got that under our belt I eased up to about 3/4 throttle and holy hell she stumbled all over the place. Would not get past 3/4. Even had the wife driving the boat while I played riding mechanic to tweak high speed mixture to no avail. Got home and pulled the plugs which were fouled at best. (not really a big surprise) I'm going to check timing again along with a fresh set of NGK's and fresh 40:1 mix.

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Last edit: by Moe.

'57 Merc Refresh 03 Jun 2020 16:33 #104929

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RickG wrote: Moe, are you a member over at J.O.M.S.? There's quite a bit of discussion on the topic over there. It's a pay site, but well worth the annual dues.


I am not, but I did find the service manual break-in, basically run a rich mixture like 32 or 25:1 for the first two tank fulls or two hours and keep it at half throttle, then no extended full throttle for the next 8 hours of run time.

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Last edit: by Moe.

'57 Merc Refresh 02 Jun 2020 12:03 #104900

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Moe, are you a member over at J.O.M.S.? There's quite a bit of discussion on the topic over there. It's a pay site, but well worth the annual dues.
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'57 Merc Refresh 02 Jun 2020 05:15 #104898

The service manual talks about a break-in period too.
Mercury Marc, 1958 Hawk II, Merc 400
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'57 Merc Refresh 01 Jun 2020 14:19 #104877

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Well, she fired right up no problem! I didn't run her real long in the test tank as I'm curious if there's any "typical" break in procedure. IE don't run wide open for X amount of time etc. I'm just going off knowledge of automotive engine break in with the understanding this is a completely different animal. Any thoughts from the more knowledgeable people out there ? A quick search of the google gave me the following:

https://maxrules.com/fixbreakin.html ]
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Last edit: by Moe.

'57 Merc Refresh 25 Feb 2020 12:22 #102344

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Thanks, we'll find out in a couple months !

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