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Message: [QUOTE="dirtbikr99, post: 1160900, member: 36912"] I have a 1999 cr250. (old but I love it) Currently Its stock bore 66.4 I've had a ported, and cut the head to raise the compression a little. I love the motor right now. However, I've come across and amazing deal on a stroked crank 74mm. 1. Is it possible to just put the stroked crank in (check to make sure it clears the cases of course) and put a 2mm spacer plate under the cylinder? Will this have any effect on the porting, timing or compression? 2. What would be the final displacement with a stock bore and a 74 mm crank? Thank you in advance to whoever can answer these questions for me! [/QUOTE]