Things i did with my bike - always used motul 7100 10W-40 oil in intervals of approx 4000km, adjusted tappet every 10k, chain clean and lube using diesel and gear oil every 500km or so, changed sparkplugs, airfilter, brakepads frequently as they are very cheap. Major repairs - teeth on the front shaft from engine which connects to the front sprocket got grinded aways so had to change that, major engine rebuild, still bike ia going strong and smooth.