I would be very cautious about a bike that's not been ridden for years unless the owner pickled it or is willing to give a very good price. Hidden problems are more likely with a bike that has just sat unused.
Definitely I would plan on replacing the tires. OEM tires were pretty bad to begin with, but they'll be pretty dried out and hard by now.
Not being smarter, I would worry about internal engine corrosion. Cylinder walls, piston rings, valve train. Any oil on those surfaces has long ago evaporated or dripped off.
Possible blockage of oil passages. Either congealing of the oil or the settling out of particulates.
I was burned on an old bike that the seller had put a lot of care into fixing up for his wife who didn't want it. Then it sat. Fork seals were bad, all the hoses needed to be replaced, and the fuel system was gummed up. New tires, new carb, etc. I put way more into bringing it back to life than it was worth! I could have purchased one new for less than I put into that old bike.
The bike you're looking at is 5 years old, so it is due for all the fluids and hoses to be replaced. Throttle cables and clutch cable probably should be replaced in case there is corrosion hiding. I'd replace the oil before starting the engine, then after running the engine briefly flush it again. Smart money would be to use a pre-oiler electric pump to flush the engine with fresh oil before even starting it, but idk if that is even possible with these engines. I would want to inspect the cylinders with a bore scope before starting it up, to ensure there are no rust spots/pits.
Last edited by Fly-Sig; 01-05-2019 at 09:44 AM.