02-10-13, 04:42 PM
Mine has a strange sewing machine chatter for the first few miles of riding that is especially noticeable at low revs like turning into a junction going down a steep hill in 2nd at about 2k rpm with the clutch not pulled in. Once the bike has warmed up properly it goes entirely or is very very hard to notice. I asked a couple of different mechanics to listen and both said it is most likely leaking exhaust. I still have the original pipes on and they are badly leaking, I've tried to plug most big holes with gun gum but I guess there is gas leaking from smaller holes somewhere. I plan on getting stainless soon so hopefully that will sort it. May be worth a look at your exhaust if it's the original, check directly under the engine there's a small plate between exhaust 2 and 3 near where they all join in to one at the back, mine had loads of holes there.