mercury outboard noob plz help

dppham

Cadet
Joined
May 25, 2011
Messages
17
outboard (mercury) serial A175405 (90Hp)

on auto repair manual site it says
90 6623151 - A902435 1985

so i guess its a 1985
i dont know if its a 6 cyclinder or 3
on the motor somewhere it says 3 cylinder.

if its a 6 they why does it only have 3 carburetors.

i took off the carbs to rebuild, first time, manage to but when i order the kit for a 3 cylinder it doesnt fit.

this motor is confusing me. a 3 or 6. i just want to make sure before ordering and returning the parts i have.

i should have done a compression test first.
the previous owner told me it need carb work because when he had it running he said their was lost of power and didnt accelerate.
the prop was tore up ( so i thought that might have been the problem + carbs).

i havnt tried to turn the motor yet (heres the noob part)
once the carbs are back in,
i put the muffs on the boat turn the water on then i turn the key? is their anything else i need to do
 

carholme

Rear Admiral
Joined
Sep 4, 2010
Messages
4,845
Re: mercury outboard noob plz help

dppham;

That s/n comes up as:

90 90 (R6) 6-cyl 6623151 0A902435 1985 USA

From here:

http://www.marinshopen.se/Motorer/O...cury2taktR66cyl80150hp/tabid/489/Default.aspx

It is a model:

1090625 MERCURY 1985 90

Parts listing:

http://www.crowleymarine.com/mercury-outboard/278.cfm

It should be a 6 cylinder engine but you can also confirm the s/n by looking on the powerhead for a disc like this:

http://img84.imageshack.us/img84/8224/391496208.jpg

How many sparkplugs do you have?

Gerry
 

dppham

Cadet
Joined
May 25, 2011
Messages
17
Re: mercury outboard noob plz help

it has 6 plugs. but why does it only have 3 carbs
 

79Merc80

Senior Chief Petty Officer
Joined
Nov 22, 2007
Messages
673
Re: mercury outboard noob plz help

Each carb runs 2 cylinders
 
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