Here are the diagrams and repair parts for Official Craftsman 143104090 4-cycle gas engine, as well as links to manuals and error code tables, if available.
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Basic engine diagram
Part #30132
The manufacturer no longer makes this part, and there's no substitute part
Basic engine diagram
Part #30269
The manufacturer no longer makes this part, and there's no substitute part
Basic engine diagram
Part #29917
The manufacturer no longer makes this part, and there's no substitute part
Basic engine diagram
Part #27513
The manufacturer no longer makes this part, and there's no substitute part
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