1997 Johnson Evinrude "EU" Accessories Service Manual, P/N 507270, Page 175Get this manual
Belt Tension Procedure 1Be sure drive belt is in good condition and correctly routedBelt must engage all pulley grooves
2Idler housing pivot screws must be loosened slightly
rn 3Set adjustment rod for belt tension of 25-30 poundsrn between the idler and flywheel pulleysBelttension is correct 4Verify belt tension using ac Gauge, PIN 984850, midway
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