Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 149Get this manual
Electrical System 3Ignition System and Ignition Control System
1) Inspection of Ignition Spark
123Disconnect plug cap from spark plugConnect plug cap to spark testerConnect spark tester clip to spark plug tip electrodeSpark Tester: PN3F3-72540-0 Spark Performance: 5mm (0.2in) or over
Start engine and check sparkIf spark is weak, check igniter (including igniter clearance) andor plug capThis test can be made without removing parts