The CDIs do have different curves. They vary by year and displacement, some years the 250s and 300s having different curves. The 300 can be more of a beast with a 250 CDI. My '03 250 was a bit of a dud off the bottom until I swapped in an '00 CDI. Maybe your bike started life as a 250 and was converted to a 300 at the factory or importer, its been done here.
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