Replacement carburetor for 4cycle small engines, part number 640349. Compatible with HMSK105159908C and HMSK105159909A engine models. Key benefits Restores reliable starting and smooth idle when an original carburetor is worn, clogged, or leaking. Directfit replacement that uses original mounting points and throttle linkage for quick installation. Precise air and fuel metering helps reduce rough running, stalling, and excessive fuel consumption caused by a faulty carburetor. Function and compatibility Designed for 4cycle engine operation to control the air fuel mixture delivered to the engine. Listed compatibility: HMSK105159908C and HMSK105159909A engine models. Part number 640349 for easy identification. Fits applications that use these engine models as a factory replacement component. Important attributes Function: carburetor for 4cycle small engines, regulates air and fuel flow for combustion. Compatibility: matches the listed engine model numbers and part number 640349 to ensure correct fit and operation. Construction: durable metal housing with precision internal components for consistent performance under normal operating conditions. Performance: supports proper idle, throttle response, and starting when installed correctly and adjusted as needed. Practical use scenarios a failing carburetor on a walkbehind lawn mower that is hard to start and idles poorly. Restore operation of a pressure washer or garden tiller that stalls under load due to fuel flow problems. a snowblower or other outdoor power equipment powered by engines with the HMSK105159908C or HMSK105159909A designation. Notes for installation Recommended professional or experienced DIY installation to ensure correct hookup of fuel lines, throttle linkage, and choke. Inspect gaskets and mounting hardware and as needed to prevent leaks and ensure a proper seal. This carburetor is intended as a replacement component compatible with the specified engine models and part number 640349.