It would sure have to be some dirty to make any difference....Funny you say that about our making your bike faster, I watched a video from ejr this morning doing their weigh in on some bikes they brought to Michigan and one of them didn't do anything but clean the bike and it was enough to make the bike bounce back and forth to a on less then what it weighed before the cleaning . And they finally posted a weight for Megatron and they have it down to i believe it was 411. I hope maybe one day I can do that to mine but for now I'm happy with its weight.
I saw the weigh in, there sure isn't much bike left, a lot had to be removed to get it to that weight. Those bikes are light....