Super Jet Cracked flywheel cover

Just bought a '90 Superjet, my first ski. The previous owner somehow got a small 2" crack on the front of the flywheel cover and just JB Weld-ed it and said he had ridden it like that for awhile. Should I be in a hurry to replace it? I've ridden it a few days now and it seems fine. Still wondering how that could have happened.
 
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