google "tradebit grizzly 125" it will cost you $14.95 but the factory service manual (FSM) is well worth it.
oh, and the grizzly 125 / used to be the "breeze" is a simple reliable easy to service little bike..just don't overload it or it will strip the output shaft on the transmission...
separate oil supply for engine and transmission.
download an owners manual while you are at it. you will learn a lot about the machine..