Suzuki GS650 Engine problems by year

Contacted suzuki, told them what happened. T ook motorcycleto dealer, they tore the motor down. Suzuki rep came and looked at it. A few days later suzuki called me and said they were not going to cover my problem under warranty. They it wasn't a factory defect, but I believe it is. There have been at least 7 other people who have had this same problem. One case involved the rear wheel of motorcycle locking up at 65 mph on the freeway. So it can be considered danagerous. Suzuki will not acknowledge there is a problem or defect. They told me this was the first time they had heard about such a problem.*Ak

While driving, experiences intermittent engine failure, when at high to low speeds, engine shuts down, dlrs' have not been able to identify problem. *Ak

Purchased motorcycle new, it leak oil and back fired please describe . *Ak