Re: what did you do to your motorized bicycle today?
I have a Yamaha tank like yours, along with the rest of the Yamaha. It came off a vintage enduro bike. The tank might be a challenge to mount since it requires channels on the frame. The rubber cushions at the front of the tank tunnel slide into the channels to hold the tank firm. The rear of the tank is held down with a rubber retainer. I have used large "O" rings on similar tanks. The tank holds 2.5 US gallaons. Is your tank clean, does it have a petcock?
"If bulls didn't have horns, everyone would be a Matador".