If it's a flat kart start with 14/65, if it's a sr champ 13/65, or some run a 13/61 with the flat kart. Now that gearing should turn 7000 plus provided your tires are close.
If it's a flat kart start with 14/65, if it's a sr champ 13/65, or some run a 13/61 with the flat kart. Now that gearing should turn 7000 plus provided your tires are close.