Especially if it’s cold. Use the choke and try to keep the bike at around 2k rpm, starting with near full choke, and slowly adjust it with the revs. This will save you tons of mantnaince. It’s best to not stress your bike until it’s warmed up too, as you are particularly prone to cracking a piston, and the higher the compression rate in your engine the greater this chance becomes. And don’t forget that your piston head(s) will warm up faster than your cylinder as a whole, so if you do go to fast to quickly, that may seize, and if you’re going more than 10 mph when that happens you can say bye-bye to your crankshaft, and hello to a nasty fall.