Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 266Get this manual
POWR CRANKCASE AND CRANKSHAFT
8 Remove the crankcase8 Measure the width of the compressed Plastigauge on each main journalCrankcase main journal color code indicator a:BlueBlackBrown Bearing color code b:BlueBlackBrown