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Message: [QUOTE="motometal, post: 1390176, member: 24727"] There was a time when I would have said 5 month old fuel should be ok unless your bike was already on the verge of pinging anyway. I've seen guys run fuel that was a year old or older with no problems. That being said, some of today's fuel really has a shortened shelf life! I've seen chain saws that wouldn't run right on gas that was only a month or two old...running lean. Fill up with fresh fuel and they would run perfect. These engines have a very short distance between carb and combustion chamber, so not much time for vaporization, maybe the light ends were gone in the fuel. [/QUOTE]