2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 147Get this manual
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ShimmingBacklash NOTE: Tighten the nut four turns after it contacts the springForward gear shim selecting tool: YB-34446-1 2, YB-34446-3 3, YB-34446-5 4, YB-34446-7 3 Measure the clearance (M) between