Hello, question for the experts. I have a 1984 Evinrude 9.9 hp. Saw videos that it can be converted to a 15 hp just by changing the carb? Yes or no? Thank you.
74 to 92 were the same basic motor 9.9 and 15 HP------1993 they went to a bigger bore., more displacement.---------Now a 9.9 may be more than 9.9 HP and a 15 may be a bit less than 15 HP.----There is marketing and decals involved.
You might get a couple hundred more RPMs running wide open if the prop is correct for the load, which technically does translate to more HP. Anything less than wide open and you have the same restricted carb as the 9.9.
Remember the old saying: "There's no replacement for displacement"
Actually the 84 models show the round tuner for the 15 HP models.------The instructional video must have missed that detail !!!----Just picked up a 1992 model 15 HP.-----Will be taking it apart for rebuild.----We will see if it has the round tuner.
I said up to ABOUT 84 shared the same tuner. 88 and later 9.9/15 hp share the round tuner.
I apologize that I don't have the manual for every motor ever made.
2 different round tuners made one short which is the later one and the longer round one which is earlier. Your 92 has the shorter round tuner on it. Easy to prove when you take it apart. I don't need a parts manual for that
Actually I get phone calls in season.----Sometimes from folks over a 1000 miles away looking for used parts.-------After talking folks will say-----Wow, your knowledge is appreciated.---Thank you very much !
Actually I get phone calls in season.----Sometimes from folks over a 1000 miles away looking for used parts.-------After talking folks will say-----Wow, your knowledge is appreciated.---Thank you very much !
The exhaust tuner is under the powerhead on that motor. It must be removed to replace the powerhead base gasket. You do not need to change the tuner, 90% of the 15 hp is in the carb.
