The chain snapped on my partners DRZ last year, dumped its oil. Hole was 25mm tall by 5mm wide & located on the vertical clutch arm housing in front of the sprocket. I cleaned out everything I could before filing a small piece of 2,5mm thick aluminium to shape, laying the bike on it's side & having a mated TiG weld over the lot - worked a treat.
I ran it a few times & changed the oil & filter twice more before riding it on the road. Wasn't worth taking it apart as it was an older bike with 20,000 miles on the clocks & the hole was in the left hand crankcase, even doing the work myself, gaskets, bearings & a used case would have equalled a fair percentage of the bike's value.
It's still going strong.
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