Ok, just received my Ghea pistons (GHEA3075) and they have 3 holes in them which are 1.1mm.
Question is, do i need to drill these holes bigger, they measure up a #57 which is a black equivalent. But most UK drivers seem to use red pistons which i believe are 3x3/64 holes, do i need to drill mine out to the same size?, or just run them as they are, if so, what weight oil do i need to run front and rear?
Jamie......
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