quote:Originally posted by garth66:
My best guess so far...
... a stress failure which occurred right atop the locknut...
I had recently commented on a failure in the same location (differnt device) as it is a common failure mode. the root of the thread is a stress concentrator and any side loading (bending) will fatigue there. if the air cleaner was touching the deck, then the engine vibrations were constanitly working the stud back and forth.
for the failure, I recomended to the customer to use a long coupling nut, ream out the top few threads so the untreaded section of the stud was inside the nut. however in this case, the best would be to eleminate the contact with the deck and the bending. making the stud not fail might force the failure into the carburator threaded section
