Baja Motorsports WD400-U Operator's Manual - Manual (Page 31)

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MANUAL PULL START
Recoil starter
Firmly grasp handle and pull slightly up until engagement can be felt. Then
pull forcefully, being careful not to pull the rope all the way out.
CAUTION:
Don’t start the engine in non-neutral or without setting the parking
brake system.
Put the transmission in neutral and set the parking brake before
starting the engine.