My 02 yamaha vstar 650 is very hard to start on cold mornings. ihave tried all kinds of things. i have to idle it up than idle it down than it will start. the chock does no good .

Sounds like your carb jets may be partially plugged, common if they are stored incorrectly, The choke circuits on these carburetors work on manifold vacuum and if you throttle the bike while trying to start it you will lose the choke affect. if they are partially plugged the only good way to fix it is to pull the carburetors and clean them. I would advise checking out www.roadstarclinic.com is a great source of information for the yamaha star line of motorcycles.

You could try adding a can of Seafoam to a full tank of gas. You need to take a long ride to run out that tank of gas to clean it up. I tried that on a bike that had been sitting and it worked. Now I add 1/2 can every 6 months to keep it clean.