I just purchased a basket case 1996 Honda CR125R, so I can ride with my kids. I found a hole in the case. Looks like a chain gave way, and tore the left side up. The hole is about 3/16" in diameter. Planning to open the case up to find the shrapnel, if it is still in there, and TIG weld it to close it. Are there any particular parts that typically wear prematurly I should look at closer than others? Are crank bearings typically replaced when this is open? Thanks.