Yamaha GP1300R WaveRunner 2008 Owner's/Operator's Manual page 45

Features and functions
and the operating conditions. (See page 77
for adjustment procedures.)
1 Yamaha Adjustable Sponson (YAS)
Up position (a):
There is less water resistance in this position,
so straight-ahead acceleration when on plane
and top speed are enhanced.
Down position (b):
This position gives the watercraft more
"hook", which enhances turning performance.
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