Hi I've got a '74 Honda XL250 with super low mileage I picked up about 7 years ago. SO here's a brief history: thing's barely been ridden but not properly stored, bring it to my guy and he de-rusts the tank, puts new ignition switch on, new battery, etc. I ride it about a year then lose my keys... bike sits for year and a half, finally got a replacement key and it won't start. I get a new spark plug, drain/clean the carb, stick new gas in the tank and kick over until my foot is sprained... I can get it started but it idles very rough and won't stay started... It sounds like there may be a clog somewhere in the fuel lines, but I'm not an expert. Any way to troubleshoot and narrow down the problem? Thanks!