I have a 3 mo old 325 Trailboss, how often do you need to change the air filter and spark plug. The filter is dusty, although I can see through it when I hold it up to the sun. The plug is a dark, but not oily.

thanks, Trailboss 2000

 

I probably dont do it all the right way but I just clean the air filter everytime I can visible see dirt on it or if I just came back from a dusty ride. As far as the spark plug I just change it every year. I have a scrambler 500 and this seems to keep it runnin nice all year.