The bike’s lineage might be hard to follow, but all you need to know about buying a used F/G650 is that in all its iterations it’s harder to kill than a cockroach. Low insurance costs, great gas mileage, and ease of maintenance leave you lots of dough for your dream ride. The few problems common to the series include worn steering-head bearings, blown fork seals, and, rarely, regulator failure. The first two could easily be due to riding off-road, while the third seems to be one of those things that pops up randomly. Carbureted models are more prone to rough running and hard starting. The engine paint is no match for the otherwise good build quality of the motorcycle, flaking and fading even on pampered bikes.