I get a fast rapid(like rev limiter fast) surging/hesitation when i'm crusing and I have the throttle at the same spot all the time. It's a sweet spot that I can find at about 1/4 throttle. If I back off or speed up it goes away. It's not doing it in a certain gear(its all gears) or a certain rpm. If i'm accelerating or driving 110 on the highways I don't notice it. I find the hotter it is(30c), the more prodominant it is. I changed the spark plugs and that didn't change anything. The spark plugs were a nice tan/off white colour. I have just over 7000kms and it started doing it last year but haven't gotten around to it yet. It seems to be more noticable now.