Greetings- I have a 1975 TY175. I am trying to sort out some problems, and the big one is the left crankcase is damaged where the clutch adjustment hole is. The whole area is gone, must have had a chain derail I'm guessing. I have not had any luck finding a crankcase half for the TY, but find lots of DT175 ones on ebay. They look similar and I'm wondering if they interchange. The bike is rideable but the clutch shaft goes up and down when the clutch is pulled and the adjustment goes back and forth. Any ideas or info greatly appreciated.