I have 2 cranks I purchased for the new Kinroad 300, to put in my 250 engine, and other then having a larger stroke it is identicle to the cn/cf 250. The head is als identicle. You may be referring to the older Kinroad 300 cc which was a yamahe based engine. When you look at the new 300 Kinroad of the few I know who purchased them before Kinroad got out of the US market they thought they had a cn-250 engine. The CN/ CF 250 has a 72mm bore and a 60mm stroke. The 300 has I believe a 71mm bore with a 68mm stroke.
TOM
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