Total Motorcycle Community Forums

okay so im starting to notice a bit of a problem on my ninja 250, its a 2000. the problem is when it is first started it is really easy to kill it when i give it a bit of gas. as it warms up it gets better, but for the first couple of minutes even the tiniest amount of throttle will kill it. any ideas?

It's called letting the bike warm up

Your choke may be maladjusted tho.

i dunno anything about the choke adjustment or anything, i can turn the choke on the instant i start the bike and it will choke it to roughly 4000rpm which it always has, i dont think that i always had to let it warm up this much, and i was riding in the winter.


ps. ohio does have real winters.

All twisting the throttle does is open the throttle valve - i.e. let more air into the carb. all a choke does is throw more fuel into the bike to allow it to run when it is cold.

So, twisting the throttle (Adding more air) causes the bike to stall. So, the assumption is that the bike isn't getting enough fuel. The question is, Why? maybe the choke isn't putting enough fuel into the bike Or the bike is too cold w/o the choke. Or, maybe there is a detail that you're missing that could be the key to the whole thing That's one bad thing about diagnosing stuff over the net.

I've found that if I fiddle with my throttle to early in the choke process the bike starts to bog as well. Or it will outright die. A little patience can go a long way.

Are your plugs fouled? My bike was/is fouling plugs regularly, and itll run fine untill you go to give it gas and then "BLAH" dies... try changing the plugs.

i thought fouled plugs too, but these plugs are only 2000 miles old. the carbs were just cleaned and whatnot two months/3000 miles ago, but i have only noticed this problem recently. i knowi could just be patient, but sometimes i dont think about it and it leaves me hanging out in the midle of an intersection.

just because the plugs are new-ish, doesnt mean they didnt get fouled.... check em.

while we are on the subject what exactly causes plugs to foul?

depends, carbs misadjusted, bad spark, lots of things..there was a thread about that somewhere not that long ago.