What's wrong with my Ninja 250R?
December 31, 2011 1:21 PM Subscribe
my 2008 kawasaki ninja 250R isn't running right. hoping someone might have an idea as to what's going on with it.
posted by austere to Travel & Transportation (12 answers total) 3 users marked this as a favorite
i left around an hour ago to run an errand and decided to take my bike as it's in the mid 60's today which is a bit uncharacteristic here in virginia. i rode a couple of miles and made a brief stop, and realized after getting back on the road that i needed to get gas. i ended up stopping at a gas station i haven't been to before (having ridden maybe 3-4 miles in all at this point). i picked up nozzle for diesel gas, somehow not realizing that there were 2 seperate nozzles. of course since i was pressing the regular unleaded button, it wasn't pumping anything. after picking up the correct nozzle and pressing the regular unleaded button again, it pumped as expected and i filled my bike up. while my bike had ridden fine to that point, it felt very sluggish when i attempted to accelerate after pulling out of the gas station lot. i think i had used very little choke to that point but i engaged it fully at that point and the bike seemed to accelerate okay to about 30-40 mph at which point it just ceased to accelerate and was clearly revving really high, which seemed to suggest to me that it was adequately warmed up. when i disengaged the choke though, the acceleration was again exceedingly sluggish, if existent at all.
the only thing that seemed to have any impact was fully engaging the choke, but again, the bike seemed to be revving much too high as it would if it was already warmed up. if i turned the choke off or it was engaged anything less than completely, the acceleration got very sluggish again.
the real kicker came when i realized that fully engaging the choke and then accelerating, the bike would get up to around 30-35 mph and then seemed to stop accelerating, and when i released or rolled off the thottle at that point, the speedometer would maintain at that speed as if the throttle was still rolled on. everything really just felt wrong about it so i ended up turning back. i haven't ever experienced a stuck throttle prior to this so i'm not sure if the throttle itself should be sticking or if it's just the motor, but again, the throttle felt as though it rolled off fine, but the engine definitely maintained. this only seemed to happen with the choke fully engaged.
the other caveat is that i just returned from a week-long vacation, so the bike had been sitting in the cold on basically a nearly empty tank for the last week. i'm not sure if that's a factor however, as the bike felt perfect prior to filling the tank. is it possible that some residual drops from the diesel nozzle mixed with an entire tank of regular unleaded could have this effect? i definitely didn't pump any diesel fuel into the tank, but the problems started immediately after i refueled, and i'm just really thrown by the fact that the bike was maintaining its speed even after i let off the thottle, and i'm not sure if it was just maintaining or if it was actually technically accelerating, since the bike wouldn't seem to go more than 30-40 mph in the first place.
sorry for the long post; just trying to be as thorough as possible. many, many thanks for any insights.