Thanks men -most helpful. From the Hot rod specs it looks like the later model (84 to 01) CR250 pin is 59.5mm, long and the ATC250R pin is 56.3mm. This seems to be the only differences between the kits.? - presume the rod length 125.4mm, and 31mm big end, 22mm small end, crank pin 24mm and gudgeon 18mm is correct for 79 model? Haven't got mine apart yet.....
Does anyone know what the correct length should be for the 78 ~ 80 model - maybe 58mm?