The belt you have should be the correct size. I have worked on the GK06 and it took the standard CN250 belt 828x22.5x30. It is not unusual for Roketa to switch things up which would be known by the exact model # with the corresponding letter after. If they used the CN250 long case the belt used would be 918x22.5x18 and if they used the cfmoto 250 which I have never seen at Roketa it would be a 868x22.5x30. How short is your belt. As stated by Jersey Devil post some good pics of the engine both right and left sides.
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