From 8hp to 9.9hp.
- Thread starter domalon
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New motor weighs about 114lbs? Old one around 85-90lbs?
I read that my motor mount was rated at 85lbs, but I've never been able to find that or any reference like that since.
You at least want to inspect your mount and possible beef it up a bit.
I personally would not put 114lbs on my mount the age it is, new maybe, but not today without some additional backing.
But if yours is solid (no cracks, stress, etc) it will probably be ok.
I read that my motor mount was rated at 85lbs, but I've never been able to find that or any reference like that since.
You at least want to inspect your mount and possible beef it up a bit.
I personally would not put 114lbs on my mount the age it is, new maybe, but not today without some additional backing.
But if yours is solid (no cracks, stress, etc) it will probably be ok.
I'm assuming that the Evinrude is a two stroke that weighs about 70# and the four stroke Nissan, if it's a manual start, is about 85#. The old mount, should carry the weight but there's an issue more torque with the four stroke that put more of a load on the mount. If the mount is original- 25+years- then the age should also be considered. Sorry, no easy answers.
Rich
Rich
I recently reinforced the mount on my 23, What I did was go inside under the cockpit and place LARGE washers on the bolts instead of the tiny ones that came factory, This really helped spread the load and make it stronger.
Just a thought.
Just a thought.
8HP Evinrude 2-stroke YACHTWIN (25" shaft) weighed approximately 64#
the long-shaft model (20") weighed 58# and the short-shaft (15") weighed 56#.
I suspect the outboard bracket will hold the weight of the new NISSAN, but I agree that if this is the original mount..... there is no time like the present to replace it, for piece of mind and because the new one could have stronger springs making it easier to lift the outboard while sailing. A new mount is not cheap, but is still a lot cheaper than repairing/replacing an outboard that fel lin the water when the old mount broke.
I don't buy the theory that one MUST replace the mounting bracket ONLY because of a switch to a 4-stroke engine, the original brackets on most of the O'DAYs (early 22 and 20 not included) were rated for a 15hp engine (figure 70-80#), so I can't see that a 4-6hp 4-stroke will harm the mounting bracket. But when talking about replacing an 8HP, 64# 2-stroke with a 9.9HP, 80-100# larger 4-stroke and factoring in the age of the bracket.... well, replacement is justified.
the long-shaft model (20") weighed 58# and the short-shaft (15") weighed 56#.
I suspect the outboard bracket will hold the weight of the new NISSAN, but I agree that if this is the original mount..... there is no time like the present to replace it, for piece of mind and because the new one could have stronger springs making it easier to lift the outboard while sailing. A new mount is not cheap, but is still a lot cheaper than repairing/replacing an outboard that fel lin the water when the old mount broke.
I don't buy the theory that one MUST replace the mounting bracket ONLY because of a switch to a 4-stroke engine, the original brackets on most of the O'DAYs (early 22 and 20 not included) were rated for a 15hp engine (figure 70-80#), so I can't see that a 4-6hp 4-stroke will harm the mounting bracket. But when talking about replacing an 8HP, 64# 2-stroke with a 9.9HP, 80-100# larger 4-stroke and factoring in the age of the bracket.... well, replacement is justified.
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