2010/07/15

Big bore engine piston ring setup sequence

Today got some issue report of GY6 100CC big bore assembly issue from some of our dealer.
100cc Big Bore Kits 139QMB 50cc Engines(69mm Valve) #88807 + F
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i thought i knew what i was doing cause i have rebuilt motors on dirtbikes,3 wheelers,and quads! i would really appriciate some help if u could please! i can get the top 2 compression rings on but i cant get the 3 oil rings on the bottom slot. the 3 all wont fit in there! i have tried to get them all to fit for a few hours i put the thin ones on the outsides around the copper ring but i can only get one of the thin ones on with the copper ring! could u please tell me what im doing wrong? can u please tell me what rings go where or show me the installation process to puting the rings on the piston properly.
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Alex checked and help to fix the issue. Must assembled the piston with the rings follow the steps by the numbers showed on the pictures could properly assemble them.

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