No, your automatic decompressor is probably not correctly adjusted (if at all present).
If it is still there, you'll notice a cable from near the kickstart shaft to the cilinder head. There's an adjuster on it. To adjust: start engine (button :-)). The cable ends on a little lever on the cilinder head. If you push the lever towards the rear wheel there is a point where you feel the exhaust valve rocker touching it intermittently. Now, the play in the cable should be adjusted so that from 'rest' position of the cable to 'touching' rocker there is 1 mm.