I've had a motorbike laid up for a few weeks now. The (unleaded) fuel was pretty low, but I didn't use any stabilising additive. Should I just start it up and see what happens, or get some additive in now, or what?
For a few weeks !!! forget it, start it up and ride it like any other day. Mine sits over winter with no fuel additives, and I never have a problem with it.
Mdoo is right I do the same with mine, no problems.
I use the electric starter to turn the engine over for a few seconds if it has been standing for awhile to circulate the engine oil and then activate the choke which starts the bike.
Go ahead, you will have no problems. My motorbike is lucky to get used once a month, less over winter! If laying up for several months, and more so in warm weather, there can be evaporation of the petrol leaving a varnish like residue inside tank/carbs etc. On rare occasions bits of this varnish flake off and cause blockages. A bit of a highjack (sorry) but why does petrol left in a can for years smell different - more oily?