Difference between Merc150 and 175 powerheads

[Benge]

G’day all,I’m looking to replace my power head due to age and lack of time to rebuild it.... What’s the difference between the early 80s 150 and 175 V6 2-strokes? I have found a good 150 power head but am wondering if it’s just carbs and reeds to get it to 175?CheersBen

[roadkill636]

150 steel bore. 175 chrome. Carbs and porting. If both are 2.4 verbal reed

[tlwjkw]

150 is gonna be a 2.0 motor...

[FUJIMO]

...depending on what year of the early 80's your referencing, but both are 122 c.i. steel sleeve powerheads. yes, both would be vertical reed motors. on the cylinder head(s)outer surface, in a little circle thats cast into the head, is the diameter of the the engines bore, for quick reference. thats if the motors are all original & never been molested, who knows...

[tlwjkw]

thought all tha 80's up, maybe '81, 175 were 2.4's after tha chrome bore showed up? (200 block halves)? they just slapped a vertical front on 'em?

[FUJIMO]

...first 2.4 chrome was a 1978 verticle reed 200(V-2000)...powerhead rated.

[FUJIMO]

...in 1982, mercury did not offer a 175. they offered the 150(122 ci), and the 200(142 ci) horizontal reed only...(which was the previous years 225)...

[FUJIMO]

...in '81, mercury offered the 140 inline, the 150/122, the 175/122, the 200/142, the 225/142...and the 300/207...

[FUJIMO]

...the next time mercury offered a 175, was in 1985, which was a chrome 2.4 vertical-reed...

[tlwjkw]

gottcha.. those years were kinda like tha change to tha "fat block" era...... like they were havin' nightmares instead of lollie pops and ice cream... way to many burnt cells ta remember all that................ did find any pics of tha "sled"?

[FUJIMO]

...mercury offered the 150/122 (V1500)for 5 years...1978, 1979, 1980, 1981 & 1982...

[tlwjkw]

didn't get into those years much.. went from tha '76 175 to tha 80 and '81 225's.. then went to tha '87 up oval and BP's with a 2.0 throne in tha mix on occasion..........

[Merc 2.5]

I had a 79 2.0 150 , when it went down, I had a 81 2.0 150 to put on , and even tho they were identical, the 79 had alot more balls then the 81 I had , both was in good shape , them old motors run good imo

[FUJIMO]

...those early year 122 motors did run well...