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Message: [QUOTE="Chili, post: 1238594, member: 29892"] When you say stock jetting did you go back to the "USA" stock or the "Rest of the World" stock settings? 03 RM's in Canada came with unbelievably fat jetting to the point my kids RM125 would barely run, if you are running the jetting that the bike shipped with there is no way it should be detonating. When we got my son's 125 leaned out to where it ran it's best we were dealing with some slight detonation. I was too cheap to run race fuel simply becuase he rode way too much and it would have broken the bank so we opted to use Torco Mach Accelerator in the fuel and it worked like a charm. [/QUOTE]