hi guys my bike has been sitting in the garage for over 4 months and has trouble starting. the battery is fine since ive been charging it. i narrowed it down to a case of bad fuel. the problem is how do i get the petrol out of the tank? ive had a look at the service manual but the layout is for a single R, it may be similiar but its also different. is there a screw where i can drain it out or would i just siphon it out from the top of the tank?