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Bailey V5 engine

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In short // GY6 "B-Block" (57mm cylinder stud spacing)
They make their own crank case.
 Aftermarket 67mm piston, cylinder and head.
The "V 5s" must have a stroker crank to give it 210cc (+2mm crank stroke maybe?)

The "B-Block" is quite rare but you can build a 180cc out of the dirt cheap standard block (125-150) with a 63mm piston and cylinder.
A guy on youtube built one out of a standard 125cc and flew it... not sure how he got on in the long term.

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