How much does it cost to maintain a 250cc four stroke Motocross bike like Kawasaki KX250F or a Yamaha YZ250F?

i would cost about 700 a year for just the normal needs chain lube air filter cleaner spark plugs etc ..... but updates to the bike like new weels new pipe can drive the cost up and up ..... it also depends on were in the world you live for both of these factors cost and wear on your stuff like tyers .... for example I live in Ireland and it costs me approx 140 euros for new tyers every 3 months because i race and because of the terain of Irish tacks ....