Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 98Get this manual
30) Removal of Valves and Springs 1Place cylinder block on the work bench 1Push in valve spring retainer by using valve spring compressor attachment 3, remove cotter pin 4, and then, remove spring and valve 6Valves, springs and other related parts should be arranged in the order they are removedValve Spring Compressor AttachmentPN3AB-99076-0
31) Inspection of Valve Springs