2003 Polaris 3 PRO X Factory Service Manual, Page 34Get this manual
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ENGINE R(IHV+DISP) IHV(DISP25.4) DISP(PIBBS) 4
Effective Displacement
Eff Disp97.89 cc IHVEff Disp IHV
Eff Comp =
Effective Compression Ratio