[dannylightning]

well i will tell you, after i did a few mods too my bike it ran like complete crap had to put in a new jet and change out the needles and all that good stuff. the first few rpm's of each gear it had plenty of power but as the rpm's got higher no torque at all, the engine would just rev up and and the bike was not going. this was after changing my pipes and putting in a k&N air filter. so i took the filter out and rode around like that till i got my jet kit. than it started to get really cold at night here. the bike was running really bad when it was cold.

got my jet kit and installed it, put my k&n filter back in and have never had a problem since. so if the bike was modified at all it just might need a bigger jet but being a big guy on a 250 probably wont help either.