My realitives in St. Alexis picked up a pair of the 07 Ventures and like he said when they are cold they do not like to pull over. Those sleds now have 1000 km on them. 200 that I put on them

. When warm you hit the starter and it takes off with less then 2 revolutions. By rope ( I forgot bout electric start) from the seat 1/2 pull. When it was cold the starter would barely turn it over and the rope felt like you were trying to pull the motor out of the sled. It would only allow you to give a long, slow, hard pull. Monday they had gotten some Magna block heaters from Canidian Tire. That did wonders.
To tie it all up I would say that it is not you or your sled. I think yama messed up with the wrong grease in the bearings. making it stiff in the cold.
P.S. That is a nice sled you have there and I think you will enjoy it.