no knock but fell on its face

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went for a ride today and not surprised, the light load bucking is still there at around 1500rpm. What is weird, ive gotten it to where the bucking happens at that rpm and light load. if i do light load around 1000rpm cant really tell its there. cant really feel it when "on" the throttle, just when im either steady cruise or coming off the throttle. Also, when I did a 1st gear pull, it cut out at 5500rpm for what seems to be no apparent reason. Any advice is appreciated.