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Wiseco Yamaha XT/TT/SR500 12:1 4th over 2.00mm

Displacement:  511cc
Bore - Standard:  87.00mm
Bore - Actual:  89.00mm
Bore - Oversize:  2.00mm
Stroke:  84.00mm
Compression Ratio - Actual:  12:1
Note:  Cylinder boring required
Note:  Lateral Gas Ported