I bought a RTF plane with a Brison 3.2 and the engine has been great. Choke on, 9 flips, ignition on and two flips later it's running -- like clockwork. I've noticed the last couple of times I've been out it's been harder to start, but I dismissed it as it's was pretty cold. Today was 65F and the 3.2 was very hard to start. It sounded normal when running and flew normally, but it was very hard to start. Since I'm new to gassers I was wondering if this sounded familiar? Do I need a new plug? Should I adjust something?

TIA for your help.