Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 109Get this manual
Power Unit 39) Assembly of Rocker Arm
1Direct magneto key groove to piston top dead centerSet piston to top dead center of compression strokeRemove oil filler cap and check that 5mm (0.2 in) hole of cam shaft gear can be seenInstall push rod plate and tighten pivot bolt to specified torquePivot Bolt25 (18 lb ft) [2.5 kgf m]
3Attach push rod 5, rocker arm and pivot 7, and then, attach pivot lock nut 84Adjust valve clearanceValve Clearance (when engine is cold) IN0.060.14 mm(0.00240.0055 in) EX0.110.19 mm(0.00430.0075 in)