I recently made the switch from 2stroke to 4stroke! haha, and I'm very new to whats different on working with them and aftermarket parts. Need less to say, I was shocked at how much easier they were to ride and how much power they have! But lets get down to business! Does anybody have the time for intervals of stuff needed done on them? I do the air filter after every ride with no exceptions, Changing the oil every 3 to 4 rides. But how long before I do the oil filter, check valves? I bought it last monday with a new engine that had only 5 minutes on it. I have it up to around 5 or 6 hours now. Beeing a noob to any four-stroke dirtbike, any help with almost anything would help.