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A drop-in replacement engine kit for the Walker MTGHS mower, built around a new Kohler Command CH25 or, in the Honda version, a GX630 V-twin. The Honda kit bundles the engine, driveline adapters, exhaust, mounting hardware, an electrical harness, a 3-year commercial warranty, a kit guarantee and unlimited technical support. It suits owners of an aging MTGHS who want to keep the deck and chassis rather than buy a new machine. Compared with a bare crate engine, the bundled adapters and harness remove most of the fabrication, though the Kohler route still needs minor wiring work.
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This is an engine replacement kit for the Walker MTGHS mower. It is offered with a new Kohler Command engine or a new V-twin Honda GX630. Each kit includes what is needed to convert the machine from the old engine to the new one, unless otherwise stated.
The Honda GX630 kit includes the engine, driveline adapters, exhaust, mounting accessories and an electrical harness. The GX630 has a two-barrel inner-vent carburetor for more precise fuel metering, a hemispherical combustion chamber, a forged steel crankshaft and pressure-fed crankshaft bearings. A high-capacity oil pump, a large-diameter air intake and a high-efficiency cooling fan support reliability and cooling.
The Kohler CH740 has an automotive-grade head gasket and hydraulic lifters, so the valve train needs no maintenance. It has a standard 10% governor and starts in temperatures from 0 to 110 degrees. The kit includes a wiring harness pigtail that simplifies the wiring, though some minor modifications are required. Detailed wiring instructions are provided. EPA regulations require the new Kohler engine to be operated with the stock air cleaner.