1996 Mercury Force 25 HP Service Manual 90-830894 895, Page 50Get this manual
Powerhead Specifications Block
Type Cylinder Displacement 25.75 cuin(422cc)
IMPORTANT: Using micrometer, measure dimension "a" at location "b" as shownDimension "a" should be 2.373 in .001
Reed Valve Opening
Opening (MaxAllowable) 0.003in(0.076mm)
Length 1.9375 in(49.2 mm)
Cylinder Bore
DiaStandard 2.375 in(60.3mm) TaperOut of Round Max0.003 in(0.08mm)
aDimension "an at right angle to piston pin0.50 in(12.7mm)
DiaStandard 2.373 in(60.27mm)