No problem. Yes that is very common for gas to have sat for awhile and gummed up the carb. I've had some sit for as little as a month and ended up with problems, however on the opposite side I've also had some sit for 6 months and be fine. I tend to go with chevron for my last fill up before storage but that's just my personal opinion. I'm also guessing if he is cleaning the carb or having it done, he's not going to be as likely to move on the price. Still should be a good bike even at his asking price though, provided everything else works out. Yes when I say you can change the gearing I'm talking about changing the sprockets. Stock gearing for an S model is 15 front 44 rear (no guarantee that's what will be on this bike as it's a very common mod to change it) Most street riders go to 15/41 to lower their RPM on the highway.