Honda Outboards BF40A/BF50A Service Manual, Page 151Get this manual
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HONDABF35A45A Shim selection table
0.40 (0.Q16) 0.35 (0.014) 0.30 (0.012) 0.25 (0.010) 0.20 10.008) 0.15 (0.006)
Refer to pages -1 and for how to read shim selection table and shim