1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 16Get this manual
If Boat Plate shows
U.SCOAST GUARD CAPACITY INFORMATI.ON MAXHP MAX PERSONS MAX WEIGHT
use Only Or Smaller!
When Rigging or Fixing any boat if transom looks Weak, tell the owner If transom is Curved, motor may come Loose Mount on Flat Surface onlyUse Shims to make surface flat