Puch exhaust pipe bolt size

Does anyone know what size bolt is used to tighten the exhaust pipe to the cylinder on a puch maxi with a kstar 50 head? Lost a bolt today, sounds great but lost some power. Was going to order some from treats, but too many options. Don't want to pull the remaining bolt if I don't have to, it's holding the gasket in place. Thanks!

Re: Puch exhaust pipe bolt size

M6...not sure about thread pitch. some guy on treatland mentioned 16mm long

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