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The studs are pretty crappy stock. I always drill out the stud holes and tap to the next size up and install quality bigger studs from NAPA.
I disagree with Helicoil for any exhaust repair, and for that matter, any repair at all.
In fact, I have never used a helicoil on anything related to a) aluminium or b) a gy6.
I cannot recommend against Helicoil anymore than I do. Just drill and tap.
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2011 Roketa MC-23-150
4T 150cc 157 qmj
24mm carb w 115 main jet and paper cone air filter
Manual petcock w Tygon fuel lines
Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust
RED spring clutch
Adjustable CDI (brand unknown, it's blue and red and works great!)
KOSO high performance variator w 12g sliders
Gates Powerlink 835-20-30 belt
GPS verified 65mph on flats.
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