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GY6 BigBore Installation (50cc)

GY6 BigBore Installation (50cc)
 GY6 Big Bore Kit Installation The installation shown here is being done on a 139QMB 50cc GY6 scooter engine. I was using a 72cc big …

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50cc Cylinder head porting

50cc Cylinder head porting
This info is from my experiments with a 139QMB cylinder head. There are much more advanced and technically correct forms of head and port work, but th…
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