Can anyone ID this critter?

[Can't Cast]

Just purchased a used "japanese" Mariner (made by Yamaha). Need some professional help in identifying it, because I can't seem to find anything conclusive searching the internet.
The motor reads 684C S 002009 on the ID plate. It's a short shaft, tiller operated, pull start motor. It has a 9.9 hp cowling, and was sold to me as a 9.9.
According to my look-up efforts it seems to be a 1978 15 hp (the chart was sketchy, or I dunno how to read it correctly...) Could this be a 15 hp with a 9.9 cowling, or will the 9.9 cowling even fit a 15?
I think it's a 15 hp, but I'd like to know for sure. It's bigger than most 9.9's I've seen, and weighs about 90 lbs vs. 55-60 for the average 9.9
You folks have helped me before, and this is a great forum with some great people. Thanks a bunch!

 

[CharlieB]

Re: Can anyone ID this critter?

Inspect the carb carefully for any #'s, also check the main jet size and repost with your findings.

The two engines are almost identical.

See here the 15

http://www.mercruiserparts.com/Show...&inbr=493&bnbr=110&bdesc=CARBURETOR/FUEL+PUMP

and here the 9.9

http://www.mercruiserparts.com/Show...g&inbr=492&bnbr=12&bdesc=CARBURETOR/FUEL+PUMP

 

[achris]

Re: Can anyone ID this critter?

That serial number comes up as a 15hp. And yes, a 9.9 cowl will fit.

 

[Can't Cast]

Re: Can anyone ID this critter?

Thanks to both of you gentlemen for verifying it's a 15hp.
I believe it to be a 1978 model 15M (Mariner)...same as a 15C (Yamaha).
Can you by chance verify that? (or at least a good guess...)

THANK YA'

 

[achris]

Re: Can anyone ID this critter?

Thanks to both of you gentlemen for verifying it's a 15hp.
I believe it to be a 1978 model 15M (Mariner)...same as a 15C (Yamaha).
Can you by chance verify that? (or at least a good guess...)

THANK YA'

Correct

 

[Can't Cast]

Re: Can anyone ID this critter?

Thanks achris. Now I know for sure what I've got.
Bought it off a guy who sold his boat years ago (without motor) and he said he was tired of it taking up space in his garage. He let me have it for $125.00 with gas tank.
It has good compression, and spark. I haven't tried to fire it off yet, but I'm probably looking at a carb rebuild and maybe a fuel pump diaphragm job at the minimum. Lower unit seems good, catches in both FWD & REV.
Have a G'Day Mate.