It depends which oil you are changing. If it is the engine oil there is a little hose on the RHS of the bike that is used for draining, just rear of the trans. It is also a good idea once in a while to take the oil hose that connects to the oil filter( the one that is flowing FROM THE ENGINE) and take it off. Point it into a bucket and start the engine. MAKE SURE you have oil in the oil bucket and continue to put some in while the engine is running. Watch the oil as it comes out and after about a litre or quart, turn the engine off and replace the hose on the oil filter. this is called a "5 Litre oil change". OK Your tranny oil is drained by the hex head screw in the middle of tranny at the bottom of the tranny, simple. The primary drive has a bolt at the bottom rear of it and is filled through the derby cover and takes about 1 1/2 Litres. Hope this helps.