1981 Johnson/Evinrude 4HP Outboards Service Manual, Page 10Get this manual
SPECIFICATIONS Models J4WCE4WC Weed less gearcase, standard length J4BRCIE4BRCI standard gearcase, standard length J4BRLCE4BRLC standard gearcase, long shaft hp (2.8 kW) at 4500 rpm
LOWER UNIT
Cooling system Combination positive displacement and centrifugal pump17 :28 Weed less 12 :25 Standard Part Number 316558 Standard-12" dia 7" pitch, blade' plastic Weed less6-14" dia 6" pitchblade plastic
Propeller gear ratio
POWERHEAD
Horsepower (Bcertified Full throttle operating range Test tank rpm with test wheel
Propeller drive pin Propeller
4000 to 5000 rpm Propell er 3800 rpm Part No310621 for Weed less 4550 rpm Part No317738 for Standard
MISCELLANEOUS
Speed control Single lever, synchronized throttle and spark Weed less38.0 Ibs(17 .2 kg) Standard39.0 Ibs(18.3 kg) Automatic rewindnylon rope
Idle rpm Engine type
600 rpm 2-cylinder, stroke cycle alternate firing 1_ 5625(39.69 mm) bore 1.375" (34 mm) stroke 93 5.28 cubic inches (87 cm )
Starter