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Making a 135 into a 150

R

restridge

New member
"I just bought a fish & sk

"I just bought a fish & ski boat with an '86 Mercury 135 Black Max outboard. The guy I bought it from told me the only difference between the 135 & 150 was the carb jetting. I looked thru the maintenance guide he gave me with it. I noticed the 135, 150 & 175 all had the same displacement & carb part #'s. The jetting for all three motors was based solely on elevation (altitude). So, what's the difference between these motors? Can my 135 be made a 150 or 175?"
 
"Best way to find out is to ge

"Best way to find out is to get parts list for the motors and start comparing. I would imagine you are going to find different reeds, exhaust (put more in, you got to be able to get more out), manifold, etc."
 
"Rob, It is likely that the m

"Rob, It is likely that the machining of the transfer and exhaust ports and perhaps the reed valves and carbs are different."
 
"porting/exhaust/timing/carbs

"porting/exhaust/timing/carbs size/jetting/gear ratio and on it goes, if it was so easy to change lots of people would do it."
 
"Actually, I have the parts li

"Actually, I have the parts list for both motors & guess what? They are the same peice of paper. The heading for them is 135/150 parts numbers. Same."
 
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