[Skunkhome]

Well, it is extremely hard to tell much without photos but rust to me would be red flag however I don't live in the rust belt. It is easy to keep a bike rust free down here if you can keep it shredded. A little rust on the chain side plates is no big deal but if it is stiff I would consider chancing as soon as possible. Riding for ten minutes every month is worst IMO that just putting it on blocks and letting it sit. 10 minutes of riding is not enough time for the engine to heat up enough to drive off the moisture released by the products of combustion. In other words you end up with a wet engine. I think I would discuss the shortcomings you have noted here and see if you can get him to come off the asking price. If you do purchase I would not drive it 70 miles home or much at all until you have had a chance to drop the oil and change the filter. While you are at it make sure your cables are all lubed and free. Also check the chain for frozen links, if they are all loose, clean, lube and adjust before you hit the road.