2004-2006 Kawasaki 900 STX Jet Ski Service Manual, Page 178Get this manual
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14-12 ELECTRICAL SYSTEM Specifications
12.5 mm (0.49 in 28 mm (1.10 in Battery voltage (14.5 0.5 V) 50 0.7 1.1 15 BTDC 250 rmin (rpm) 25 BTDC 000 rmin (rpm) 0.18 0.24 2.7 3.7 140 or more NGK BR9