Choke problem the bike will not start even in warm weather if the choke is not on. In cold weather (below 40 degrees) the bike will not start at all. The distance the choke lever moves in approx. 2 inches. In warm weather to choke it you have to pull it as far as it will go in the choked position and you have to hold it in the choked position (with pressure) until it starts. When it starts you can release pressure and the choke will still be on. The distance from choke on to no choke is approx. 1/4 inch, even though the lever moves 2 inches, therefore there is 1 3/4 inches that do nothing. There is no way to adjust the choke while driving with only 1/4 inch of play. Even though motorcycle cold with choke on to motorcycle warm with no choke is 1/4 inch, while the bike warms up you can only move the choke lever 1/16 inch at a time during warm up stage. if you move it more, the motorcycle will stall. The dealership says this is normal and four strokes don't start in cold weather. Please help!? If you have any questions ask.

SOURCE: wont stay running with out the choke on

it sounds like you need a carb clean performed. the idle cuciut jet is probably dirty and that is the jet that supplies gas to the combustion process at idle rpm's. when you have the choke pulled out it is adding fuel and air so when you shut off the choke the fuel supply goes away. for the oils use yamalube 2 stroke oil for pre-mix and 10w -30 gear oil for your tranny.

SOURCE: the motorcycle will only start if the choke is all

a choke is designed to restrict air so that the mixture is rich (more fuel) for warm up. no choke should be used after 5 minutes or so. heres what you need to do. take the carb apart and on the bottom in the bowl of the carb are your jets make sure they are all clean and clear so that all circuits are open (quarter throttle, mid throttle and full throttle.) each jet controls parts of those three ranges. also turn your mixture screw which is usually located right under the motor sie of the carb. turn it all the way in then out 2 turns if you live in high elevation, turn it out only 1 turn and see how it all works. one last thing your problem might be solved by he second option first so try it first.

SOURCE: Keihin CVK-D36 carbs on a 20 yr old ZZR 600

It sounds like your bike has been sitting in storage for an extended period of time (a year or more) - and the carburetors are plugged up. If this is the case, they will need to be completely disassembled and cleaned out.
If it hasn't been sitting (and the carbs aren't plugged up) then check that all of the normal tune-up items have been performed, especially valve adjustment, oil and filters, spark plugs, etc. If this fails to produce positive results, perform a compression check on the engine. Each cylinder must be able to produce at least 140 psi of compression in order to run and idle properly.

SOURCE: Hi, I bought a used motorcycle

How to use your choke correctly. The choke is only to be used for starting a cold engine. If it is a lever, usually you pull it up for on , and push it down for off. look for some type off arrow, or up & down. To start your cold engine, turn on fuel tap, give full choke, turn key on and press starter or kick start, it is very important that you do not use the throttle while starting with the choke, just turn the key on, and press the starter with full ckoke, and no throttle. Once the bike fires and starts, turn down the choke a little and find a idle, after a few minits, you can turn off the choke and ride off. The use off the choke is only for starting a cold engine.

Testimonial: "Thanks for making me understand."