Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 30Get this manual
SPECIAL TOOLS SPECIAL TOOLS Using the correct special tools recommended by Yamaha, will aid the work and enable accurate assembly and tune-upImprovising and using improper tools can damage the equipment
For U.S.Aand Canada, use part numbers that start with "J-", "YB-" "YM-", "YU-" or"YW-"For other countries, use part numbers that start with "90890-"1 Engine tachometer PNYU-08036-B 90890-06760 Pilot screw driver PNN.A90890-03154