ALSO;
If it isn't too much work, check the air filter. If someones trying to sell a bike with a dirty filter, they probably didn't clean it much when they were riding it either. I've even seen filters that had come unglued on bikes for sale :bang: Wouldn't hurt to check the oil, but its kinda hard to go by unless it smells bad or has discoloration from a water leak, because on the bikes you're looking at, the oil will look dirty right after an oil change because of the wet clutch. Also inspect the motor for oil leaks. Shift shaft and kick start seals are easy/cheap to replace, a leak between case halves isn't as easy. Get bike on stand, check wheel bearings, rear suspension free play, fork free play. Pay attention to how smoothly clutch engages. I've tried many bikes that were "grabby" clutches. Upon inspection the clutch basket was notched on most of these. Keep track of defects, mentally add the value of the work you would want to put on each bike you look at to get it up to your standards, and take that into consideration when deciding.