1984-1986 Mercury Force 4HP Outboards Service Manual, Page 38Get this manual
A.INTAKE Inlet port Iuncovered, fuel mixture enters combu.tlon ch.mberFlow IMInem 01 trh fuel mlxlure helppu.h out exh.u.t B COMPRESSION Intake .nd exh.u.t ports arcovered by pl.tonPr.ure In combuon chamber Incr d.crIn cr.nkca 1I0wlng fr fuel mlxtu, to enter through r_d