Is a fuel filter absolutely necessary? Did these bikes come stock with fuel filter? The reason I ask is because mine is leaking when I turn the gas on and now the bike wont start. I have compression, cleaned the carb, and have spark, the air filter is clean. Now I know the air/gas mixture is all messed up also! Any suggestions on fuel filter and carb tuning, I need all the feed back I can get. Frustration levels are up and tired of smelling like gas!