Serial number not found

[Blystone]

I bought an old boat and and I'm trying to figure out the year and model number etc but the serial number is not found everywhere I look. It is a 90 hp mercury outboard inline 6 cyl serial number 6571855. If anyone could point me in the right direction I'm trying to find service book. Thanks.

 

[Chris1956]

Looks like a 1984. If so, it will have six ignition coils. Posting a picture also helps narrow it down.

 

[Fun Times]

Just put a 0 in front of the serial number it should come up. Your model number is 1090624 making it a 1984.

http://www.iboats.com/MERCURY-90-6-CYL-1984-1986/dm/view_id.1702002
http://www.mercruiserparts.com/90-6-cyl--6436123-up

Mercury Service Manual Part Number 90-86134--4
Covers engine models,
75, 80 & 85 (4 Cylinder)
AND
90, 115 &140 (In-line 6 Cylinder)
AND
150 (In-line 6 Cylinder)
(U) 4590512 and Above
(A) 8043775 and Above
(B) 9139350 and Above
(C) 7091098 and Above
(U) 4112635 and Above
(A) 8027115 and Above
(C) 7047258 and Above
(U) 4121435 and Above
(A) 8028040 and Above
(C) 7048783 and Above

 

[Blystone]

Thank you for the info.

 

[Fun Times]

Thank you for the info.

Happy we could help, good luck.:encouragement: