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The only way to know the displacement for sure it to pull the cylinder head and measure it. Even the serial number stamped into the engine case may be incorrect as I found out on the CG engine in my quad. Engine case numbers say 171FMM which would be a 71mm bore 250cc class but it actually measures 63.5mm which makes it 200cc. Correct label would be 163FML. Haven't measured the 167FMM engine bore in my other quad but I suspect it too is 63.5mm.
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