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Looks like you have the ring set for a 2.7 CIS piston. Ring size for the CIS pistons: Top ring-1.478 to 1.490mm, Middle ring-1.728 to 1.740mm and oil ring-3.978 to 3.990mm.
The piston in your photo looks to be a 90mm RS piston for MFI or Carbs not CIS. So you have the wrong ring set.
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Mark Jung
Bend, OR
MFI Werks.com
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