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#1
01-20-2025, 03:55 PM
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Kohler K301 Head
I began rebuilding a Kohler K301AQS which was on a 1250 Cub. It appeared that the exhaust valve was hitting the spark plug and had knocked it sideways. The motor has been completely rebuilt with help from this forum and others.
I attempted to put a helicoil in the head, but when I went to start it last night the plug came out with the helicoil. I'm guessing that when the last spark plug had gotten knocked sideways it messed the threads up enough to where the helicoil did not have anything to hold on to. I have found a couple possible options and would like to get some other people's opinions. 1. Tap the head out to 18mm and use a champion D-9 plug. I've heard that this is not the best option for the 4th Generation head, which I have, that places the spark plug straight over top of the exhaust valve. 2. Take the head to a machine shop where they can weld and machine new threads into the head. I believe this and option 3 are the best options. 3. Get a new head. From what I have found online, most machine shops would charge around the price of a brand-new head for the engine. I could also search for a used head on Ebay and possibly save a few dollars from option 2. 4. Another possible option that I have thought about is trying to find a helicoil with a wider outer diameter and the same 14mm thread sizes. I have not been able to find one yet, but someone may know of one. I would love to hear other people's input about this. 
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.
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