Just noticed your post.
The small hole is JUST big enough for you to turn the tap (deliberate to maintain structure). If you have a post 03 with the fuel reserve light then I suggest you leave the tap permanently on reserve (I do)--as the light is pretty accurate on my bike at least--and it saves spluttering to a stop at the most inconvenient places.
Originally Posted by Paves
Chris, I've just bought a set of these from you (Chris Desmond ordered them), and they look great, and I haven't even fitted them yet. I've recently come from a KLR650 to the 640adv so I'm still fairly new to this bike. A dry fit of the left side tankguard has me confused. When the KLR650 starts to run out of fuel I simply turn the fuel tap to reserve while I'm riding. I've automatically been doing the same thing with the 640. But it looks to me like I won't be able to this once the tankguards are fitted. What do you do? Do you have the tap on reserve all the time you're riding?