ok the smoke sounds normal but what about antifreeze levels?
it doesnt have reverse right?if not the this is how you do it
to replace the bearing(s) what you need to do is have about 3 ish hours set aside cause its your first time. loosen track tension all the way off and count the turns of the bolts (to make it easyer to retighten) remove the rear spring tension on rear triangle ajusters also remove the spring retainer on skid rail towards the front just follow the spring arm and you will see it. there will be a little tension on the blocks but nothin to be afraid of just hold spring up while you take bolt out.
remover the rear skid (4 bolts in tunnel). now look inside of tunnel on right side (recoil side) and you will see a drain plug for the chaincase (remove to drain chaincase oil). remove chaincase cover (6 bolts i think) remove chain tension (on mine i had to take it off) remove bolt on bottom gear and remove gear and chain.
now you will be able to see 3 nuts on studs holding the bearing retainer take them off. now go to otherside (clutch side) and do the same on speedo drive (three nuts with carrage bolts inside of tunnel) now take driveshaft and push towards chaincase and now you should be able to take the bearing off chaincase side then drive shaft will just slide back out under tunnel towards clutch.
during reinstallation have a friend handy to help put rear skid back in.
P.S. when you change speedo side bearing you might as well do chaincase bearing too other wise you will be doing this
goodluck have fun and ask questions if you need help