2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 178Get this manual
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Lower unit Calculated number 0.310.40 0.410.50 0.510.60 Shim thickness (mm) 0.30 0.40 0.50 0.60
2 Set the shift rod to the neutral position at the lower unitF R
S6AG6510