Smaller bikes are easier to kick over- even with a high comp ratio. The 270 is a beast in comparison. Getting that big piston, flywheel and crank spun up quickly to produce a healthy spark can be a challenge. All things even, an Irdium plug can improve starting if your struggling to kick it over with speed. If your a light weight, make sure you get above the bike to get more of your weight behind the KS lever.
Good luck -