The Unicorn CB is a good bike, looks great too.
When you go for a new bike, you simply have to do a PDI ( pre delivery inspection ). Check each and everything as far as possible.
- Wheels/tyres -
- Put the bike on main stand, and rotate the front and rear wheels, look for a wobble, either in the rim or in the tyre.
- Bodywork
- check all over the bodywork for scratches/dents/marks that are higher than normal. Most commuter segment bikes do get some amount of scratches during transport, but then that can be fixed by the dealer.
- Headlight/taillight/indicators -
- Check for proper alignment and make sure they are working. And nothing is bent or looks installed incorrectly
- Under the seat, look for any loose nuts/screws, and make sure everything is secured.
- Engine, controls
- check brake levers for adequate play, and that they are working fine ( how a brake lever works fine? well it should grab properly, not loose ).
- Check accelerator, should not have excessive play when twisting the throttle.
- Gear shifter should be smooth and precise, not rattling
- check for signs of any oil leak around the engine. And all nuts and bolts should be new, no worn out bolts should be visible, else thats an indication of some work done on the bike after the factory.
- Suspension -
- Check that both front forks are ok in operation and are not leaking oil, nor are there any marks on the inner tubes.
When in doubt, read the owners manual right there, and see what all has been specified in regular maintenance and do that. Take your time.
Lemme know if you have any doubts, but first read up online as much as you can about pre delivery inspection of a vehicle.
And if you are going for a unicorn because someone bhaiya/uncle/friend highly recommend it, please do specify. And buy something that suits your requirements and character. A bike can be simply a vehicle to get you from A to B, and it can also be an extension of yourself. take your pick.