Good used bottom end off a 400ex. Came off a running machine that the top end started to smoke and was pulled and ended up not rebuilding. Case half’s are in good shape with no cracks. Does look like the chain came off at one point but didn’t cause any major damage. Shifts through the gears and Crank big end has normal play doesn’t seem to be excessive. Only issue is that the previous owner appears to have welded the front drive sprocket on to the countershaft.