So i bought a 2010 crf250r from a dealer and it didn't come with a chain guide and i never noticed this, the chain popped off one day and broke the engine guard and put a hole where the clutch cable connects i don't know if you can weld it or have to buy a new one.
welcome to CRF's Only. i'll never say something can't be welded (cost me lunch once saying that...won't make that mistake again). however, in this case, better to replace it.