AMA Supersport Racer
Join Date: Sep 2008
Thanked 111 Times in 96 Posts
Feedback Score: 10 reviews
Welcome to the site! The only way to check mileage would be to run a carfax report on the bike. But you will find limitations with that, because assuming he's been bringing it in to get the odometer read during his yearly inspection (if his state also requires one). If not, then there's no way you would know. It could be a faulty wire with the gauges, because 16,000 vs. 6,000, maybe the 1 is glitching where it's not showing up properly.
Regarding the gas gauge, it just depends on the bike. Are we talking the difference between a bar or 2? Or more like showing all or none? I have an 08, the gas gauge is pretty accurate, but does fluctuate. If the bike is leaned over, it will read differently or take a minute before it reads correctly again.
I know you're concerned with the mileage being off, but these bikes can run forever. If you're ok with 16k on the odometer which I would be, then I wouldn't mind it showing 6. The reason why lots of bikes don't have high mileage is because people lose interest, crash and wreck the bike beyond repair or turn it into a trackbike. There are forum members here with 250K miles on their bikes.
Resolving the issue. You can just get a new gauge and/or new wiring harness. However, the mileage of 16K is linked to the odometer. You change the odometer, and you'll start from the point of the new/used odometer. So then you may have the issue of it showing weird if you were to go for an inspection and your carfax report is suspect. I'd check more for damage, if the bike has been down, are the original plastics on, etc.
Personally I'd look for an 07+ bike (its' the same up to 2012), better model, rides better. But if you're getting a good deal, and like the bike go for it. Good luck!