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.
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