They are gas powered.
Gas but, the KH9 you have to qualify for in a minimum of 5 races which is the faster kart
They are gasoline powered and the building is vented pretty well. I would probably advise against going if you have any history of breathing difficulties such as asthma.
Gas powered with 2 class of engine if you rank high enough you get to use the faster class cart
Thanks! Your answer is awaiting moderation.