Having trouble with a friends 00' drz400. It has an fmf power core exhaust and the power up jet kit. Its sat quite a bit throughout its life with very little maintenance, and was never winterized properly. The last time it was out when we stopped for a break the bike flooded and soaked the air filter with gas. We rung out the filter and continued riding. A little further into the ride we stopped again because it started running funny, he opened the gas cap but it created a strong vacuum and was hard to get open. After that it seemed to run ok the rest of the day. Since then I've cleaned the carb several times. Now when you shut it off it either soaks the air filter or dumps gas into the case. I'm not familiar with suzukis, but the petcock doesn't seem to have an off position...just prime, on and reserve. Any suggestions on where to go from here? I'm stuck and tired of seeing it sitting in my garage, lol.