k3, I have the same "problem" with my mc18. I think its the computer that advances the ignition a little to heat the engine up quickly. Since you have a 2 stroke, its no problem. The oil pump has a solenoid attachd to it that increases the rate of oil flow to the carbs when cold to remedy cold-start wear.

Dont wory about it, its normal, but just check if your idle setls at 1500 +- when its hot.