Andy, I just put a Junior LO206 on a cadet kart. Pain in the A$$ but can be done with patience. Luckily, the cadet kart never came with a welded right seat strut. Used a clamp on strut instead. Did not even use the left hand welded strut either. Just used another clamp on strut. Why don’t you bring it by my house and let me look at it. I might come up with some ideas and as you know, I’m quite familiar with both Kosmic karts and the Briggs engines/components.