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LARGE HOLE IS 57MM * THESE ALLOW A 54MM (95CC) CYLINDER TO SLIDE THRU * BUT YOU CAN USE ANY CYLINDER FROM STOCK 50CC (39MM) TO THE 95CC * USE WITH OR WITHOUT PAPER GASKETS * IF WITHOUT PAPER YOU MAY WANT TO ADD A SUPER LIGHT FILM OF RTV AROUND THE OIL PASSAGE HOLES

@ NEW!!! ALLOY_CYLINDER BASE_GASKETS !! IN_1_1.5_&_2MM THICKNESS'S 50_&_70_HONDA'S XR_CRF_Z_CT_ATC TRX90_&_70 CLONE/50/70/90 ALLOYBASEPICK_THE_THICKNESS: 
@ BIG_BORE CYLINDER BASE_GASKET Z50 CT70 CRF50 CRF70 TRX90 LIFAN (267F)@ BIG_BORE CYLINDER BASE_GASKET Z50 CT70 CRF50 CRF70 TRX90 LIFAN (267F)58MM OPENING FOR THE CYLINDER SKIRT.

THESE WILL ACUALLY WORK FOR ANYTHING FROM A 39MM BORE TO A 54MM BORE CYLINDER

267F