9.9

[VINTAGEVECTOR225]

does anybody know the diff between 9.9 and a 15hp evenrude,can you cut the head?and how much? bump up the timing?and how much?releive the exaust?i am rebulding for a guy for his inflateabel and he wants more power,i have ordered boyseen reeds for it and was wondering what else i could do to it.i am not familer whith this moter,thanks

[jtb]

does anybody know the diff between 9.9 and a 15hp evenrude,can you cut the head?and how much? bump up the timing?and how much?releive the exaust?i am rebulding for a guy for his inflateabel and he wants more power,i have ordered boyseen reeds for it and was wondering what else i could do to it.i am not familer whith this moter,thanks

change the carb to a 15. that to me would be the biggest diff.

[jtb]

Thinking about it I may have a new style 15 carb (plastic top) @ my house. I'll look tonight if you are interested.

[VINTAGEVECTOR225]

Thinking about it I may have a new style 15 carb (plastic top) @ my house. I'll look tonight if you are interested.

thanks

[Skoontz]

I believe are the only two significant differences. that plastic topped carb won't flow like the all metal versions, but it will get the basic job done.

[jtb]

I believe are the only two significant differences. that plastic topped carb won't flow like the all metal versions, but it will get the basic job done.

can't get my metal one, it's no the J-hydro!

[Skoontz]

Metal carbs available, Sea Way Marine, $175.00 each

[jeff55vDSH]

does anybody know the diff between 9.9 and a 15hp evenrude

I dunno how to change from a 9.9 to 15.
BUT-
I do know how to change a motor from a 15 to a 9.9...change the engine cover.

At least, that seems to be how everyone around here does it.

[VINTAGEVECTOR225]

i did some research and on the parts break down the 9.9 and the15 have the same part#.there is a screw on the cam arm that pushes the throttel that is adjusted so the carb only opens up to 3/4,could this be the diff in the hp?there is adjustment to full throttel on this screw.but can you cut the head?bump up timing?open exaust?i normaly work on merc v6,s and that is what i do to them.any info would help,do racers us this motor?what do they do?or is it some secret.

[fbref5269]

the difference in the 9.9 and the 15 is the carb. i sat with a johnson dealer a few years back and the block, crankcase, tower, exhaust tube all have the same part number for both the 9.9 and the 15. the only difference is the carb. and the difference is the 9.9 carb opening in the back is 7/8" and the 15 opening in the back is 1". not much of a difference.

frank