How old is my YAMAHA 20hp.

[lowdouble]

It is a 20hp, I think its late 80s but need to know for spare parts orders.
the serial No plate says.

YAMAHA 20MB
653 S 005697

Thankyou for your help.

 

[Barnacle_Bill]

Re: How old is my YAMAHA 20hp.

http://www.autorepairmanuals.biz/site/573683/page/599291

 

[lowdouble]

Re: How old is my YAMAHA 20hp.

Thankyou very much for the link.
do you agree that the s before the serial numder means the engine is a 1980 model then?

If so I am going to struggle to get parts. are most engines (ie 9.9, 15. 20 25hp) generic on certain parts?