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2.55mm BTDC 83 and 84 model 240 & 250's SEM ignition on the WR's and Motoplat on CR's and XC's1.95 mm for 82 model 250 SEM ignition on the WR's and Motoplat on CR's and XC's2.43 mm for 1981 model 250 Motoplat on WR's , Cr's and XC's