I have decided to go with a 240 big bore kit from ken. I just have to wait till have some funds to purchase it. In the mean time what carb can you use for the set up. I'm looking for something more affordable rather then extravagant. Are there any other machines that will cross over? I took a look on ebay for 36mm carb, there are so many that I wouldn't know which one to get. Can you eliminate the carb switch? What is the purpose of the carb switch?