Merc 9.9 Conversion to 15

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08-09-2011
DuckLn

Merc 9.9 Conversion to 15

I have a couple Merc 9.9's (1 electric start and 1 manual) and am not sure on the year model (around early to mid 90's is my best guess) but am wondering if I can convert them to a 15 by replacing the carb. I've done this with a johnnyrude but never with a merc.

Does anybody know if this is possible and what year models it will work on?

Thanks
08-09-2011
Skoontz

I believe the Merc runs all the same stuff as the 15, and has a restrictor behind the carb, or, the 15 uses a different exhaust tuner, or both. It's the OMC that uses a different carb and tuner.
08-09-2011
mercguy

Quote:

Originally Posted by DuckLn

I have a couple Merc 9.9's (1 electric start and 1 manual) and am not sure on the year model (around early to mid 90's is my best guess) but am wondering if I can convert them to a 15 by replacing the carb. I've done this with a johnnyrude but never with a merc.

Does anybody know if this is possible and what year models it will work on?

Thanks

you need the 15hp carb and exhaust tuner................any year will work..........

PS: if your motor has a "squarish" type tiller handle, it is a 94 or newer, if the tiller handle is round, the motor is pre-94......
08-10-2011
hydroplay

There are also 2 different exhaust tuners for 15hp motors. They are similar in length (from memory) but the older one is a smaller diameter. If you gotta buy one get the newer one. If you scrounge, either should be OK.