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System pressure adjustment, one shim?

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Afternoon all. '82 SC spec for system pressure is 4.5-5.2 bar. Mine is at 4.7 so it will be a little rich. I have the shims and a seal kit is on order. Question is, how much difference will adding one shim make? I have lots of shims but really want to take it apart once only! 

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Don’t sweat it too much Chris - the shims are quick & easy to change.


IIRC, 0.1mm shim change roughly equals 0.8-1.0psi change

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