Good info.

Given your last bike you are right a Chinese copy of a 1980's Japanese bike would be an improvement.. :D

Just kidding but seriously the modern bike will be better in many ways including suspension over what you are used to so I think you will love the 620. Some things will have a ...

If you plan on a full service and new tires you should be about $1000 more than the purchase price. Given the price will be close to a used 1000 that is a bigger discussion.

With 8000 miles on the 620 that bike should be good for a long time with regular services.

Yes there are fixes for the ...

Oh and the wrench goes on at set mileage, the service may have been done but ask for proof that the valves and belts were done at 6500 miles.

A major service will set you back $500-800 depending on parts so you can plan for hidden costs. and be sure to compare.

620 no service = 2000+700(service ...

I think this 620 multi was stolen recently so you are probably in the clear just cover your self.

corbin seat is a aftermarket add on, mine came with one and some like them I would be happy with stock. everyone is different so give it a try.

As I mentioned the 620 has enough power for the roll ...

On a used 620 multi I would

change tires
change belts
change oil if dark at all
change brake and clutch fluid if dark at all.

see if the service that was due at 6500 miles was done (valve adjust and fuel injection).
Chain if cared for should last to a average of 12000 miles, inspect the o-rings ...

Not sure if your question is in the right spot you might ask in the air cold section or other places I would suggest you PM a moderator to find out for sure.

I am in the US so no help, sorry.