Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 123Get this manual
Powerhead Specifications Block
Type 60 V, Cycle Displacement 225 185 cuin(3.0 Litre)
IMPORTANT: Using micrometer, measure dimension
" A" at location shownDimension "A" should be 3.6210 in .0005 for STANDARD size piston
Reed Valve Opening
Opening (Max 0.020 in(O.SOmm)
o ,Iimension "A" Right An gle
3.00 in(76.2mm)
1to Piston 9
Cylinder Bore
225 DiaStandard
1 in(25.4mm)
3.625 in(92.1 mm)
0.003 in(0.076 mm)
TaperOut of Round Max
Piston Ring