2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 260Get this manual
Shimming (T50) (for USA and Canada) 2Install the taper roller bearing shim selecting tools
Select the forward gear shims (T1)
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The sum of T1 and should not be more than MO
Forward gear shim thickness (T1) MO-M