Spun, how do you fix?

♣Slew Foot♣ /
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so i get the sachs 505 1a upto 33 mph

with just minor pipe and airbox adjustments and after a long ride i see the flywheel is begining to back off. when i got it it was pretty worn (the threads). after taking the flywheel off i see the threads are toast, i retap it several times and got a locknut it still spun off, WTF do i have to weld it on there or what. any ideas i really do not want to splay the whole engine and put out $ on a new crank, when it has been running better than ever.

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