hey guys quick question is there a good fuel line /carb cleaner that u can add to the gas ??? dont want to add anything and end up messing things up plan on doing a carb rebuild this winter and i just want to get thru this yr of running by the way there oldies both are 92 yamaha wr500 so as u see dont want to spend alot on them but when they run there good for the kids thx alot