Anyone know bore & stroke of 1989 Force 85?

[BWSmith]

I'm guessing 3.312 X 2.80. Please correct me if I'm wrong. I believe this is an un-altered garden variety model. Trying to figure out displacement. Thanks a bunch

Bryan

 

[maxum247]

Re: Anyone know bore & stroke of 1989 Force 85?

I have a 1989 125 Force and the operator's manual that came with it for that year lists the 85 hp Force (Bore and Stroke) as 3.31" x 2.80"
(8.42 x 7.11 cm)

(Displacement) listed for the 85 hp Force in the manual was 72.4 Cubic inches.
(1186 cc)

 

[BWSmith]

Re: Anyone know bore & stroke of 1989 Force 85?

Thanks, Maxum. I recall seeing 72 cubic inches specified elsewhere in this forum, but was not sure.

Bryan

 

[Frank Acampora]

Re: Anyone know bore & stroke of 1989 Force 85?

And don't get to thinking: I know how your mind works--I can hear the gears turning from here: The 90 was 3.375 bore but although the block is the same, you can NOT bore out the 85 to that. It requires different sleeves.