1996 Mercury Force 25 HP Service Manual 90-830894 895, Page 10Get this manual
NOTE: When performing an acceleration test, it is recommended that stop watch be used to improve testing accuracyA wrist watch with second hand may also be substituted5Prop "break loose" (sudden higher RPM), if not excessive, in some cases can be beneficial during acceleration If undesirable "break loose" occurs, it can be decreased by tilting the outboard further underIf it remains excessive with all similar propellers, the outboard must be lowered6It is suggested that all applicable data be recorded on chart and retained for future reference7After several propellers of different pitch andor design have been tried, select one that best serves the general purpose of the boatThe selected propeller should enable the engine to operate within its recommended full throttle RPM rangewithout excessive propeller "break loose" during acceleration or turnsA second propeller that would make both suitable spare or special purpose alternate might also be desirable Gear Housing Lubrication
NOTE: Gear housing lubricant capacity is 7.6 floz(225 ml)