If it is a crack I would see if widening the surface with a Dremel and filling it with a liquid metal would hold. Or maybe a touch of weld.
TIME SERT steel threads for Old Hondas
Just thought I would throw in my experience on this site, because it has helped me in the past.
I bought a 1981 CB400t as a fix and sell, knowing there were a couple issues with it out of the gate. One of which was the drain plug had been overtightened, stripping the threads and causing a leak. I wanted to give the TimeSert fix a try, which is a steel thread insert kit. Expensive, at $100, but comes with 6 plugs. So I got it, equipment was great, worked as per directions, and the bike still leaks oil. Its possible that user error caused the failure, but I doubt it. The kit is made for cars and such not bikes. My suspicion is that the insert is longer/thicker than the aluminum case, so oil sneaks in behind the threads and leaks through between the threads and the aluminum case.
So, my advice is for $100 to buy a used engine that has blown top end bits and scalp the lower case half. Then you come away with some spare parts rather than just a pair of thread cutters.
I bought a 1981 CB400t as a fix and sell, knowing there were a couple issues with it out of the gate. One of which was the drain plug had been overtightened, stripping the threads and causing a leak. I wanted to give the TimeSert fix a try, which is a steel thread insert kit. Expensive, at $100, but comes with 6 plugs. So I got it, equipment was great, worked as per directions, and the bike still leaks oil. Its possible that user error caused the failure, but I doubt it. The kit is made for cars and such not bikes. My suspicion is that the insert is longer/thicker than the aluminum case, so oil sneaks in behind the threads and leaks through between the threads and the aluminum case.
So, my advice is for $100 to buy a used engine that has blown top end bits and scalp the lower case half. Then you come away with some spare parts rather than just a pair of thread cutters.
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