Mine has never been rough when I start out, but I do let it warm up enough that the temp needle has started moving up while I get my gear on. It makes a couple grumbles when I first start it, but that goes away quick once the oil starts moving. Its been in the high 30's low 40's here too.
I think the fuel injection is a huge improvement. The only problem I have noticed is that when the revs get down to around 2500, just a little positive throttle will feel like it is running out of gas, but since it's rarely ever down that low, I doesn't happen often.