Fork seals - look for leakage. its a diy fix though
Wheel spokes - bent/missing/unscrewing shiny/clean threads.If the spokes are off you may feel a wobble or out of balance feel not your typical diy fix,but doable if you have the nerve/patience
Rear drum brakes- there is an indicator notch on the actuating arm and another on the hub where the arm attaches.If they are lined up then it needs shoes.another diy fix
Drive chain- there are indicator notches on the swing arm to see how much adjustment is left on the chain
Cold natured- they just are
Kick start- dont go to kick start it and think all the engine compression is gone because its super easy to kick over,they are very easy bikes to kick.If you have ever kicked a 4 stroke dirt bike divide the required force by 5 and that gives you an idea
Charging system- it too is a diy fix,but can be a little pricey.Take a dc meter and check to see if it charges.youre looking for 13.5-14.5 at 3000 rpm
Tires and brake lines- check for the typical dry rot
Electrical- check for rats nests/chopped up wiring and judge accordingly.New harness are available for around $75
I'm sure i missed a lot,just what i got off the top of my head
I always like to make sure the antifreeze looks good ,too