two very different models. The 1991 had a single pickup ignition, was known to be hard to start. switched to twin pickups in 93- I think - made it much easier to start. As previously stated s model ( ADR model) had steel tank, and later version 96 on, e start. While working in the local Suzuki shop I had a 94 350R enduro version and loved it, bit soft on the suspension side, rode it in MX regularly,and embarrassed a lot of guys in the 4T class on their much more expensive huskies at the Ravenswood cup. One of the guys who worked at another shop had a big bore kit, cam, carb and staintune for his, which I bought off him, really livened it up, as earlier stated made it not so easy to ride but personally I loved it. Clutches didn't like abuse though...