ALSO< did you relocate the rad to the front rack, or did the old owner??
HOW Long have you owned the atv since you bought it off the old owner??
MY reason for asking is this, folks that move rad's, tend to ride DEEP mud,
that increases the odds of them SINKING there atv
a atv that went under water can have dirt and crap in a motor, and MANY folks, will after sinking a ATV"
clean it up make it pretty, change oil a few times, to make it look GOOD
then sell it to some poor sucker, that shortly after they buy it and start using it, it starts to smoke, and there on sites like this asking for help!
NO offence meant saying this,a s it is what it is, just informing you, this too happens
dirt and crap left inside motor after it SANK< does NOT come out from oil changes MOST times!
and when its left in, it sooner or later eats a top end or worse and makes the motor start to smoke and then loose power, and , turns into a motor work needed repair!
SO< again, how long have you owned atv since buying??
and you 100% did NOT change oil filter??
as if you install a oil filter BACKWARDS< it will also starve a motor of oil and make it smoke real fast!