2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 17Get this manual
SPEC Power unit
Specifications
Maintenance specification
Unit kPa (kgfcm2, psi) kPa (kgfcm2, psi) mm (in) Model F90TR 860 (8.6, 124.7) 510 (5.1, 74.0) at engine idle speed
Power unit Minimum compression pressure(1) Oil pressure(2) Cylinder head Warpage limit
0.1 (0.0039)
(lines indicate straightedge position) Camshaft cap inside diameter Cylinders Bore size Taper limit Out-of-round limit Pistons Piston diameter (D) Measuring point (H) Piston clearance Over size piston diameter Piston rings Top ring Dimension Dimension End gap Side clearance 2nd piston ring Dimension Dimension End gap Side clearance