1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 172Get this manual
Specifications BLOCK REED VALVE OPENING STROKE CYLINDER BORE PISTON PISTON RING Type Displacement Opening (MaxAllowable) Length DiaStandard TaperOut of Round Max DiaStandard End Gap With ThermostatPoppet Idle W.O.TAll Models WO ThermostatPoppet Idle W.O.TPoppet Valve Opening 1994-1997 Poppet Valve Opening 1998Newer ylLoop harged 39.3 cuin(644.4cc) 0.020 in(0.50mm) 2.796 in(71.0mm) 2.993 in(76.0mm) 0.003 in(0.08mm) 2.988 in(75.90mm) 0.010 into 0.018 in(0.254mm to 0.457mm) 121-12 SI 750 PMSI 5000 PMSI 750 PMSI 5000 PM 900-1000 PM 3000-3500 PM