Got the YS 110 mounted. Firewall to backside of spinner, 5-1/2" nice and close to aid in balance. No line up on the blue accent stripe. Once I finish up the plumbing and throttle linkage we will see about balancing. Looks like I'll be needing a new cowl. Betwwen the old access holes and the new ones required it will look like swiss cheese. Good ventilation though. Joe