75hp merc triple carbs on 40 merc

[BRzuki]

What (if any) is the issue with putting the 75hp merc carbs on the 40/50/60 motors? They look all the same except the venturi diameter, but I haven't heard of anyone doing this.:confused:

Seems to me that the displacement is there to benefit from the extra fuel and air but maybe there is something I am missing.

[fs5]

what model 75hp is it mate?
i was looking into getting bigger carbs for mine and the old 75/90 ones were the same as whats on my 55.
dunno about the newer models though.

[BRzuki]

year 2000 or newer models

[fs5]

have you measured the venturi on them?(at the butterfly)if you have whats the diameter mate?
you might be onto something!

[lcp]

look like they shared the same carb with 90 mercury 3 cylinder.....any idea who can port these lost foam type mercury 40?

[BRzuki]

I haven't measured anything...don't have them in my hand but found some for sale and was curious.

[fs5]

i measured a set off early 90's motor and they were excactly the same.
might do some searching on mercruiser parts and see what i can find.

[60mercury]

I found that the 75 hp 2001 above have .620 jets my 60 carbs have .060 ' I ordered .620 jet n put in my motor n Gaines 200 rpm

[Mark75H]

More importantly, what color change was made on your spark plugs?

[Jackson]

More importantly, what color change was made on your spark plugs?

I agree!

[60mercury]

I do have my motor from hydro tech , I'm on the last gallon of 12 of 25.1 oil!!
Spark plugs are dry black but they are old ones ill Change to new ones and largen da gap .10 give it a tad longer spark n run da piss out it testing prop n tabs. Dam I love ported motors!!!

[kraazyboat]

I have a set of 90 hp 3 cly. mercury carbs. Motor is about a 1998 to 2000. $125. Dave 815 990 6455

[tyst67]

What would matter if you could put 75 or 90 carbs on a 60? You still need to be able to burn the extra fuel! You will be way faster and more efficient if you are burning properly with 60 carbs then if you had 75 carbs and you are burning too rich! If you can set it up so you are burning golden brown with a 75 or 90 carb it would be unreal! But you will have to find some hotter plugs and the last time I checked I couldn't find better plugs