mine schedule: 
2T top up every 3-5 weeks
chain lube every 500km/1week
every 4000km/2months, change gear oil
every 6000km/3months, change spark plug
every 10000km/6months, wash carb, air filter,
every 20000km/12months, wash block, piston, pistonring, valve,
change coolant
others like tyres, chain n sprockets, brake pad, battery,
brakefluid, clutch plate, headlight, dashboard bulbs, etc.. upon
self inspection