Hi all new to the world of xt's and have just bought an 09 plate with 2500miles on the clock anyway fitted akropvic cans and dna stage 1 and 2 filters when to do the co adjustment but is already at 20 it was all standard when i bought it how do i know if this is default level ? P.S bike does seem fairly surgy in 2nd low revs. Thanks for any advise in advance