is a 4 stroke dirt bike harder to maintain than a 2 stroke?

Buy the shop manual for your make model and year, read it and follow the service schedule found inside. Most of the questions found here could be avoided if folks only followed this simple advice.
 
It is. You don't have to pop the head and scrape carbon on a 4-stroke but you do have to maintain cam chains, valve clearances and contend with valve train wear and tear. I had a 2-stroke you could disassemble in two minutes flat for cleaning or overhaul. You won't do that with a 4-stroke.
 
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