I have a 09 klx250sf with an after market carb big bore kit. It seams to crank over hard and it has almost left me stuck 2 times now. I replaced the battery a week ago and it wouldn't not start today. Idk if the starter is tired or the valves are out of adjustment or the carb is messed up.. I also would like to know if any one else has a big bore kit and if there bike cranks hard because of the kit. Is there a better starter they sell? Any help would be great.