CDHPOWER Support Team. Gas motor bolts,studs,screws,washers set to 2 stroke gas motor engine 66cc/80cc;. Gas motor bolts,studs,screws,washers set to 2 stroke gas motor engine 66cc/80cc. Bolts 4pcs to cylinder: M8x112mm (M8 Studs for Motor Mount Block thread size:M8 1.25);.