Vessel #1 departed from boat launch, proceeding towards middle of lake.  Across from launch, boat stalled in middle of lake.  Operator tried starting boat again many times only to get a clicking sound and eventually an explosion (flash) under engine cover/compartment. At time of explosion, all occupants jumped into water (not wearing PFDs) where they were rescued by good samaritan passing by in pontoon.  Operator stated she had not run blower or aired out engine compartment before starting, and other passengers in boat confirmed that.  Two passengers got burns on legs and ankles. One passenger was treated for burns at Metro Hospital.
City of Sparta                