Craftsman 917.257573 Owner's Manual page 49

REPAIR PARTS
15 HP 42" TRACTOR - - MODEL NUMBER 917.257573
BRIGGS & STRATTON ENGINE - MODEL NUMBER 28N707, TYPE NUMBER 0121-01
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121 CARBURETOR OVERHAUL KIT
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"_ REQUIRES SPECIAL TOOLS
TO INSTALL. SEE REPAIR
INSTRUCTION MANUAL.
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1033 VALVE OVERHAUL KIT
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49