2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 93Get this manual

2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 93

Quality of the image is intentionally reduced!

Power unit Valve spring free length a: 53.20 mm (2.0945 in) 2 Measure the valve spring tilt bReplace if above specification
Checking the valve lifters
1 Check the valve lifters for damage,