Hi, I’ve got a 1999 Artic Cat Z440 that I just picked up from my boss a few weeks ago. He’s always had trouble running it through the years or hard starts or having to run on full/half choke while riding. When I bought it from him I pulled the carb to clean it but realized the choke assembly was cross threaded, so I went and bought a new mikuni 34-389 carb and put it on. Now it won’t idle at all, and will only run at very high rpms. As soon as you throttle down it stalls. Any ideas??