2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 95Get this manual

2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 95

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Power unit 4 Measure the valve guide inside diameterValve guide inside diameter: Intake and exhaust: 6.0006.018 mm (0.23620.2369 in)
1 Eliminate carbon deposits from the valve with scraper2 Appl