MC, If your crank is not worn more than what will clean up at .010 undersize, and your bore will clean up at .030 oversize (or less) you should have no trouble rebuilding this unit. Follow the tightening instructions with the new connecting rod exactly, and BE SURE to install the rod on the crank according to instructions, so the oil hole in the cap is in the proper orientation. Kohler replacement parts are VERY expensive, and people seem to have pretty good luck with some aftermarket parts, which cuts the cost of the piston and rod A LOT! If you decide to go the generic route, you might want to search on ebay for "Kohler engine", and check auction parts prices compared to local parts sources. Of course, you have to know what oversize piston you need, or if the crank will be ground .010. That is the only undersized rod commonly available, but some machine shops have "tricks" to get around that. Here is a discussion related to one aftermarket parts supplier. Link
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