In fact i dunno what the difference between a chain and a belt, but the mecano said a belt???..anyway dosent really matter, it broke down. Because it broken up when i was riding, the valves goed play in the engine and the cylinder so they changed the head and other stuffs (sorry if i use wrong english term in english, im from quebec soo
) So thats it..hope you nerver have to face it if out of warranty.