If that RMZ is hard to start check the valves, run them on the looser side of the tolerance. Just a thought, thats what I do on my Husky and it likes it better, Exhaust spec is b/t 0.006-0.008, I run them at 0.008. intake is 0.004-0.006, I run them at 0.006. They tighten as they wear, Also run leaded Sunoco 112 Premium for a little led lapping. But hey, it's what "I" do, you can do what "you" want with "your" bikes.
I was told the bike just had a rebuild last summer and the valves where just put in spec before they put it up for sale. They had several bikes and a private track etc etc bla, bla bla but I had no reason not to believe them since they said they don't work on their bikes they let the shop do all of their maintenance, cough cough @Rack all of their bikes look to very well kept and this bike was completely spotless. It was just a spare bike not needed anymore hence the sale. They had more money than they knew what to do with, which is why I thought they weren't lying about the shop and why I thought of @Rack again anyway it may be the fact that it was all BS but again I only had it out once. It will fire up first or second kick cold and runs like a scalded dog just don't kill it. I pop start it right back up just kicking it is a mofo.