Will a 1997 cr250 crankshaft work on a 1990 cr250?

A 1997 CR250 crankshaft will not be compatible with a 1990 CR250 due to differences in the design and specifications of the engines. The 1990 model has a different stroke and bearing sizes compared to the 1997 version. Additionally, there may be variations in the transmission and cases that affect fitment. It's best to use parts specifically designed for each model year to ensure proper performance and reliability.