Jumpy idle

[CamaroMan79]

I have a 2009 Agility 125 with 625 miles on it. Lately the idle has been going up and down when I come to a stop. The idle also goes up and down when its warming up in the morning which i assumed was normal because its cold, but since its doing it after warmed up Im thinking something needs to be adjusted on the carb?

If I took it into a dealer would they fix this for free? I still have a year and a half on the warranty.

Also I notice when I come to a stop and press the rear brake lever, the vibration of the engine changes. Is this normal?

[wildwildip]

Mine has always done what your describing. 

As far as the rear brake it just puts more vibration from the motor, into the frame when you pull the rear brake in.  Thus why you feel it when its in, and you dont when its out.