I'll guess you have the lash set wrong. Pull the plug. Poke something down the hole. I like a pencil but a screwdriver works. Pull the cord slowly till both valves are closed and the piston is up,TDC. Adjust your lash with feeler guages .002 intake and .003 exhaust. Pull the cord a couple times and recheck. Seal it back up. Pop the plug back in. If I lost you, watch the video in the sticky thread. In my opinion there is no noticeable difference in pull starting the 14cc head.