250 HP JET DRIVE INSTALLATION MANUAL
Page 39
90-10240040 DECEMBER 2003
Trim Plate Adjustment
The Jet Drive unit trim plate is factory set for general applications. Should a particular boat
experience porpoising problems, the trim plate can be adjusted as follows:
1. Loosen both jam nuts on trim plate (one starboard and one port).
2. Turn both screws the exact same number of turns. Tighten both jam nuts against trim
plate. The distance from top of nut to bottom of boss should be equal on both sides.
a
b
c
d
e
f
a-Jam Nut with Washer (Two: One On Each Side)
b-Jam Nut
c-Small Diameter Washer
d-Large Diameter Washer
e-Plate
f-Screw
WARNING
Adjusting the trim plate may affect boat handling (steering). Overly sensitive
steering or reduced turning ability could result from trim plate adjustments. Boat
handling characteristics also vary with the load distribution in the boat. Use caution
after adjusting: check for acceptable handling characteristics under all loading
conditions. Failure to adequately test the boat could result in inadequate steering
control resulting in property damage, personal injury or death.
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