Just picked up my GSXF 400 from the shop after a top end rebuild. Delighted to have it back after months, but it's running a little rough and feels as though it's not getting enough fuel (or spark?) I noticed air in the top of the inline fuel filter, and in fact when I got home noticed it was mostly full of air with fuel just flowing across the bottom. Is it normal to have air in the fuel hose/filter? Or does it need to be 'bled' or got rid of in some other way. I guess I can take it back to them, but if it's a 5 min fix I can do that's even better.