I have an 01 r6 with a two brothers exhaust. Bike is plenty fast, but today in an enclosed area, I let it loose a little bit, I got to about 130 pretty fast, than it didn't really want to go alot higher, it kept going slowly til about 140 then it kinda died so I let off. I was in 4th gear at like 13 and it just didn't want to go more than 140, and if it did it was going VERY slow. Is that normal? These bikes are supposed to go 150-160 shouldn't I be able to get up higher than 140 without much effort?
Could have something to do with the jetting of the carbs, either too lean (not enough fuel) or rich (too much fuel) could cause that issue, pull the plugs and if they are more of a white color the bike is too lean and black and sooty means the bike is too rich
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