our long cases already open 70mm, You don't need to modify it when go with up granded matchingit can go for 61mm to 67mm cylinder. And the long case set is included crankcase gasket.
( GY6 エンジンケース )
KYMCO GY6 engine case set
GY6-KS-L long engine case, Used on Scooter 12 or 13 inch wheels, ( 330 mm ) 57 spacing called B
4/ Sset
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Especificación detallada
KYMCO GY6 kit de bloque del motor
GY6-KS-L bloque largo del motor(4/kit), se usa en rueda de 12 o 13 pulgadas, 57 separación.