Pre-departure panic: how much can a scooter REALLY carry?

It's all way too heavy! Do we have to take all ALL the 15 litres of extra fuel??? If we add up our weight + luggage + fuel... how much is this little scooter supposed to carry??? That's not even going to make it up the first hill, let alone a curve... Two hours later, all loaded. The windshield had to come off. We will get to savour all the bugs and dust Africa has to offer, but what don't you do