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A drop-in replacement engine kit for the Walker MTGHS mower, built around a Kohler Command CH18 or a Honda GX630 V-twin. The Honda version ships with the exhaust, mounting hardware, driveline adapters and a wiring harness, plus a three-year commercial warranty and unlimited technical support. It suits owners of an aging MTGHS whose original engine is worn out and who want to keep the deck and chassis rather than buy a new machine. Against a bare crate engine, the kit's value is the adapters and harness that make installation a bolt-on job.
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This is an engine replacement kit for the Walker MTGHS mower. It is offered with a new Kohler Command CH740 engine or a new Honda GX630 V-twin engine, and it includes what is needed to convert the machine from the old engine to the new one.
The Honda GX630 has a two-barrel inner-vent carburetor for more precise fuel metering. Its fuel economy is similar to fuel injection, with the simplicity of carburetion. It also has a hemispherical combustion chamber, a forged steel crankshaft and pressure-fed crankshaft bearings. A high-capacity pump delivers oil consistently. A large-diameter air intake and a high-efficiency cooling fan help with cooling.
The Kohler CH740 starts in all weather conditions, from 0 to 110 degrees. It has a standard 10% governor, an automotive-grade head gasket and hydraulic lifters that need no valve train maintenance. 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 run with the stock air cleaner, even though the original air cleaner element can be transferred mechanically.