i would never run my bike on full choke from cold!
all you are doing is revving a cold engine which for the first minute or so has not had fresh oil pumped up around the rockers. Not good at all!
Best to just get it started and if the revs climb after a few seconds or so just knock down the choke so it is just running at idle! don't let it idle for too long just a couple of minutes, then just ride it! take it easy for a few miles untill you get the temp up to about 70oC