Ancient history: AMA used to have a once a year coupon special. Fox would list one or two engines as a coupon special with a discount. This caused me to buy several Fox engines that my local hobby shop didn't carry. After trying them, I liked them. Especially a .36 with a carburetor that looked like it was closed when it was open. Seems like the low speed adjustment was the fuel nipple, but the carb worked well for me.