so many problems at 1 
the bike dont start the lights are weak  and when i push the start button i hear "buzzz buzzz"
the battery is new. abut 2 month .
the bike start only with run in second gear
what cause the prob? and where  to loock for
thanks

Dead battery.  You probably turned the key past the "lock" position to the "park" position and drained the battery with the parking lights.  Find a battery charger with a 12V 5A rate and charge it for at least 8 hours.  That should solve your problem.

no. its happen after long ride i stop to rest and then its happen. if the switch is been on the park position there are no
light be work.in my case the lights works but weak

Using a voltmeter on the battery, what's the voltage?

Does the battery have fluid at the proper levels?

Was the battery charged before it was installed?

I'd check the alternator/magneto for proper charging also.  You can do a basic check by checking the voltage at the battery with the engine on and revving around 5k rpm.  You should see 14-15V or so if the alternator is working.  I wouldn't say that this is a bullet proof test, but if it looks good, then the alternator is unlikely to be bad.

i had a similar problem a couple days after i got my bike, all of a sudden it lost all power but the battery was full, it hardly ran after it was push started the lights would dim as soon as u roll on the throttle and the bike would want to stall. it turns out the connection where the positive lead from the battery goes to, i forget what it was called, came loose and disconnected- factory forgot to crimp it according to the dealership.