Ok, don't laugh but a friend's kid just bought this old jr bike off ebay and it is a piece. That said he is 11 and we are trying to figure this thing out.I am a car guy and not a bike guy so......here goes..... I see the oil tank on the side and it seems to fill down into the crankcase

then there is tube coming out the bottom of the "carburetor" that looks to need a hose and is now leaking oil. Also a tube coming out the top of crankcase .....oil injector? but is not attached to anything. Any ideas would help Thanks,