Is This Bad?

[330exrider4life]

Ok, when my EX is cold and i put the choke fully on, it starts up great and idles perfect, but when i rev it up a small amount of greyish white smoke comes out of my exhaust but when i take the choke off and its warmed up it dosen't smoke at all and the motor is very strong i cant keep the front wheels on the ground.. condensation? rings? valve gap? what?

[smr]

not a big deal...you just have a little wear on the motor. When the motor warms up the piston and rings swell a little and it stops smoking. It's normal, don't worry about it.

It could also be valve guids.

[330exrider4life]

ohh ok as long as its normal... you dont think im in need of a rebuild soon do you? i just made it a big bore like 2 years ago