So, I'm a new owner of a Husqvarna SM610, (06) and I've put about 100 or so miles on it.(it currently has about 4500 total miles) I think it vibrates too much-I initially attributed it to being a thumper, but I did a search, and came up with all sorts of answers. so, I pulled the clutch side cover off, and checked the balancer shaft- I'm getting a 38mm socket today, and am going to pull the gear to check the woodruff key, but this has me scratching my head. found this when I pulled the cover- Somebody obviously did a modification- my question is- is this correct? why would someone change the marks to be lined up? How much vibration should I expect from this engine? at certain speeds, it almost blurs my vision, but isn't intolerable, at highway speeds, I couldn't imagine riding for more than an hour or 2 like this.