1998 Johnson Evinrude "EC" Accessories Service Manual, P/N 520213, Page 174Get this manual
Belt Tension Procedure 1Be sure drive belt is in good condition and correctly routedBelt must engage all pulley grooves
rn 2Idler housing pivot screws must be loosened slightly.3Set adjustment rod for belt tension of 25-30 pounds
rn between the idler and flywheel pulleysBeltPIN 984850, mid4Verify belt tension using QVIC Gauge, way tension is correct
when the plunger is flush with the end of the handle 5Start engine and run it at 800 RPM for two minutesStop engine and repeat Steps and 4