The "Family" number—in this case, YBSXS.4652VB—is an identifier mandated by the Environmental Protection Agency (EPA). It groups engines that share similar emission characteristics.
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To get the right parts, you must ignore the emission sticker and look for numbers of the engine. These are typically 11 to 12 characters long. Common locations to find these numbers include: Small Engine Model Number Search | Briggs & Stratton The "Family" number—in this case, YBSXS
: Stamped on the front or side of the overhead valve (OHV) cover. The "Family" number—in this case