I normally use keenserts for repairing threads if there is enough material https://www.mcmaster.com/key-locking-threaded-inserts . I absolutely hate helicoils due to failures common and then you have an even bigger hole to fix . For something with low torque specs and will only be tightened once they're not that bad , just not for repeated re-torquing .
The step stud would need to be 65-75mm IIRC . Take an 8mm bolt(cut the head of) or chunk of threaded rod and drill and tap it for 6mm x 1. then Loctite a 6mm stud or threaded rod into it ( red or orange -#277 Loctite) , walla , long stepped stud . Helps to have access to a lathe .
A person could even just drill the 8mm bolt/all-thread using a 5mm drill and turn the 6mm stud/all-thread down to 5mm and press it into the 8mm hole so the ends are flush and weld it on the end so it won't pull out . Or just turn and thread your own stepped stud on the lathe using an 8mm x 80mm bolt -10.9 grade , leaving the 8mm threads on one end and rethreading the other after turning it down to 6mm.
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'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
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