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Gear ratio for a sumo?

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Recently got my hands on a 2006 crf250r as my new track toy and now im curious to know what a good gear ratio would be for a big bore yz250f converted to supermoto?

Currently running 13:49 but i always seem to run out of power at peak rpms.

A friend told me just to change the front sprocket and id be fine, but last time I took his advice things didnt go so well.

Any input would be great, thanks for reading

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