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Old November 17th, 2010, 10:19 PM   #1
tungzta
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2009 250 ninja stalling after startup and when trying to pick up from a stop

I have a 2009 250R and it is a pain to get it started in regular weather and even more so in cold weather. I usually let the bike warm for 5 minutes or so with the choke fully engaged. The idle RPM averages 4000-5000. Then i disengage the choke and it falls to below 1000.

After this started happening, I would let it warm for close to ten minutes with the choke fully engaged in cold AND warm weather conditions. I disengage the choke and it again falls slightly below 1000 RPM. Afterward, I'll try to get going, and as soon as i give throttle with the clutch pulled in, the RPM falls off and the bike stalls.

If i do manage to get the bike running (bike warmed up for 5-10minutes), there are times when i ride a distance, come to a light after driving 5-10 miles and stop. As soon as i come to a complete stop, there are times when the bike stalls out just seconds later. Even after being properly warmed. The idle RPM consistently runs at ~1000 RPM.

I was wondering if raising the idle RPM to 1500-2000 would help. Please let me know asap, it is annoying and embarrassing when stalling out in front of people and in the middle of traffic. Thanks.
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Old November 17th, 2010, 10:37 PM   #2
Chubbs032
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yes 2k
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Old November 17th, 2010, 10:40 PM   #3
tungzta
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thanks for the quick reply. But I would still like to get more opinions.
...And i've read that having an idle rpm over 1600 is bad.
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Old November 17th, 2010, 10:58 PM   #4
setasai
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Have you shimmed your carb needles yet? If not that'll help dramatically. Otherwise, before I did that mod, I rode another 5ish minutes with choke on before turning it off mid-ride. See if that helps. I had a similar issue when i first bought it. After 100 or so miles i got annoyed and shimmed the needles. Now warmup takes a short 100 meter ride with choke on.
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Old November 17th, 2010, 11:01 PM   #5
tungzta
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i thought you weren't supposed to ride with the choke on...?
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Old November 17th, 2010, 11:06 PM   #6
setasai
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Not longterm. As far as I know a mile or two at warm-up wont do any harm. Maybe some of the more experienced riders can confirm. I've been doing it all year and it's been running great. Essentially to my understanding, it's like consistently reving the throttle a little.
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Old November 18th, 2010, 12:09 AM   #7
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No need to sit there and let it warm up for 5 minutes (or 10 minutes). Once it's running smoothly, get on and ride down the road. It will come up to temp that much faster while under load than idling in the driveway.
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Old November 18th, 2010, 12:38 AM   #8
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set your idle speed to 1500rpm after the bike has completely warmed up and I bet your problems go away.
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Old November 18th, 2010, 04:01 AM   #9
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Second the 1500
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Old November 18th, 2010, 06:50 AM   #10
g21-30
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Quote:
Originally Posted by tungzta View Post
i thought you weren't supposed to ride with the choke on...?
The choke is NOT a plate! Just another jet opening, which allows more gas to flow! It is OK to ride with the choke on.


The solution is to shim the needles or install a jet kit.
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Old November 26th, 2010, 01:41 PM   #11
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/moved to new-gen tech
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