1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 253Get this manual

1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 253

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SHIMMING (FOR USA AND CANADA)
Shimming Y8-39799

If the original shim(s) is unavailable, start with 1.2 mm shim4 Measure: Specified measurement (M) Out of specification -7 Adjust