Hi
This is not the first time i've seen the front sprocket welded on, if you have the patiance it can be repaired in place, first grind the weld off and remove the old sprocket, then take a fine needle file and file the remaining weld from between the spline, you can use a hack saw blade to clean the slot for the locking washer.
The shaft is made of hardened steel the weld is only mild and if care is taken can be cleaned up. It took me a day to sort out a sprocket that had been welded on one of my 1VJ engines.
Just take your time. Hope this is of some help Skip.
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