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  Use only top two mounting holes for 50hp 2 strk?

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Author Topic:   Use only top two mounting holes for 50hp 2 strk?
peter ortisi posted 05-14-2002 03:10 PM ET (US)   Profile for peter ortisi   Send Email to peter ortisi  
I have a similar problem as RB. I am putting
a new 50 Merc 2 stroke on a 15'. There is only one setting in which the top holes line up and the bottom holes are at the lowest point of the well that you can get a nut on.
The problem is that at this setting my cavitation plate is 1.5'' above the bottom of the transom. I could fix this by using a
higher bolt hole on the top, but then I would
have no bolt holes in the bottom of the engine that would clear the bottom of the well. Any ideas?
lhg posted 05-14-2002 04:25 PM ET (US)     Profile for lhg    
There are many 15' Sport owners here that could help you, but I am sure this hull will handle the standard bolt pattern engine brackets, any brand, and at standard mounting heights. Raising the engine 3/4" is probably acceptable also.

My guess is that the top holes from your previous engine are too low, and may need to be plugged and filled, then four new holes drilled. Use the Mercury bolt pattern template that comes with your new engine to work this out. The lower holes should have the bolt heads on the inside, and should be at the bottom of the splashwell. The SS washer may need a bend in it.

Tom W Clark posted 05-14-2002 08:52 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

I'm not sure I understand correctly. You have a 15' that already has holes from a previous motor? What kind of motor?

The 15' hull and transom accommodates a standard bolt pattern with no problem at the bottom of the splashwell like the old 13's.

Is there something weird about the Merc 50 hp 4 stroke's mounting bracket? My 1979 15' Striper accommodated its 70 hp OMC motor with no problem. That motor had a standard BIA bolt pattern and I recall the motor being all the way down. Perhaps the BIA standard has changed in recent years?

Tom W Clark posted 05-15-2002 02:16 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
I don't know what I was thinking. My 15' had its motor mounted using the auxiliary blind holes that OMC provides. I don't know what you do if you have a Merc.

One option that would work just fine is to go ahead and do what Whaler used to recommend and use lag bolts for the lower mount. They'll be plenty strong enough for your motor. You definitely do not want to use just the upper holes.

Bruce Montgomery's solution for his Nauset would probably work as well. The only catch is you need to patch the hole you cut in the hull to get the bracket in there.

Clark Roberts posted 05-15-2002 06:32 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Peter, try it at 1 1/2" up and see how she runs.. my guess is that it will be ideal at this height as I have run many , many engines on 15's and all have been dialed in at around that height. Clark... SCN
jameso posted 05-15-2002 08:50 AM ET (US)     Profile for jameso  Send Email to jameso     
My engine bracket is approx 1 3/4 inches above the transom, 15 with 50 HP OMC. Take Clark's advice.
Jim Armstrong
Bigshot posted 05-15-2002 02:30 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Ditto with clark. 1.5" aint nothing.

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