Welcome Lido, Tell us where you are from. Its important to knowing what kind of mice you found in the air cleaner. Its also good to know whose close to you with info, parts sources, and or support on technical issues. Why not add your general locality to your signature line (done through the profile). If your tanks nasty, clean it well and add a fuel filter in the fuel line or you will be back into that carb again and again. Good luck. Tom