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Re: Trouble starting on warm starts sometimes.
This really sounds like a need to replace the intake gaskets. When the bike warms up the gaskets loose their seal leading to a lean condition that makes it almost impossible to start, until bike cools down. Gaskets are cheap, this would be my first place to begin. Hope this helps.
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Check your ignition coils. Sometimes they fail with an open circuit, this can sometimes close up when the machine is cold and open again when it heats up. So. it will start when cold and fail when it warms up.
I am having trouble with your english translation of the symptom. However, if your bike starts and runs fine once it is warmed up and initially starts fine in warm weather this indicates a clogged choke circuit in the carburator and will require a thourough and proper cleaning of the carb.
More than likely, the idle (pilot) jet is partially clogged. This is common when it will idle fine with the choke on, but won't idle without it. Sometimes a fuel treatment will clean the carburator, but not usually successful in cleaning the idle jet. Usually it requires removing the carburator bowl and and cleaning with the use of a gauge wire. The idle jet is usually recessed (next to the main jet).
A good video to show a generic carburator rebuild can be found at this link: http://www.youtube.com/watch?v=exa467_eoXw The guy goes through a pretty detailed description while going throught the process. The carburator will not look exactly like yours, but it will be similar internally.
first drain the carby, then set your air mixture screw 2 turns out, from the fully turned in position. The starting proceedure is as follows, when the engine is COLD, turn on fuel, pull on the choke fully, and kick the engine over. DO NOT use any throttle, when the engine is cold, and the choke is on. Remember Choke on, NO throttle. When warm, no choke, and a little throttle when kicking.