Will a 1992 cr250 crankshaft fit 1991 cr250?

No, the crankshaft from a 1992 CR250 will not fit a 1991 CR250. While both models are Honda CR250s, there are significant differences between the two years that prevent the interchangeability of certain parts, including the crankshaft.

Here are the key differences between the 1991 and 1992 Honda CR250 crankshafts:

1. Crankshaft Design: The crankshaft designs for the 1991 and 1992 CR250s are different. The 1991 CR250 features a one-piece forged crankshaft, while the 1992 CR250 utilizes a two-piece crankshaft with a connecting rod.

2. Connecting Rod: As mentioned above, the 1991 and 1992 CR250s have different connecting rods. The 1991 model has a one-piece connecting rod, while the 1992 model has a two-piece connecting rod with a separate big-end bearing.

3. Crankshaft Dimensions: The dimensions of the crankshafts are also different between the 1991 and 1992 CR250s. The 1991 crankshaft has a stroke of 58.6mm, while the 1992 crankshaft has a stroke of 56mm. Additionally, the crank journals and main bearing sizes are different between the two years.

Due to these differences, the crankshafts from the 1992 CR250 are not compatible with the 1991 CR250. If you require a replacement crankshaft for your 1991 CR250, it's essential to obtain the correct part specifically designed for that model year to ensure proper fitment and performance.