I’m thinking that most things mounted to the smooth running CR250 take a beating to the point of failure over time. ;-) Still the best option for competitive 250 superkart racing with more than 2 entries IMO. My current mount (about 10 years old) all but came off of the chassis in pieces. That’s not too bad of a life cycle considering the abuse.
I personally like the shorter mount better to keep the engine lower in the chassis….but the carb angle pretty steep in that position. I’ll be trying the lower with my case ind. project using a floatless pump around arrangement first….if that proves to be unsuccessful then I’ll raise the engine and use my Dellorto.