Tons4pints
New Member
I am in the process of restoring a '74 R90S that was a barn find. It is a total frame off restoration/engine rebuild. Just got the motor apart enough to see that the crankshaft is cracked. Does anyone know if the R90S crankshaft is the same as what BMW used in in the R60/R70/R90? I am pretty sure these are compatible with the R90S, but thought I better check since this is the first time I have jacked around with a R90S. Best regards,