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Old 07-20-2009, 10:42 AM   #1 (permalink)
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Default 05 250 only runs with choke fully engaged....

i have a 05 250. it has been sitting for about 2 weeks due to me being out of town. i go to start it and it wont start. I use the choke, and it will run. the moment i remove choke the bike dies. ill let it run for about 15-20 minutes with the choke engaged and the moment i remove the choke the bike dies....what could possibly be wrong?
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Old 07-20-2009, 01:01 PM   #2 (permalink)
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First, check the airbox to make sure something isn't living in there. (mice, birds, small children, etc..)

But, I'd almost guarantee you need to clean your carb out... sounds like clogged jets.
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Old 07-20-2009, 01:15 PM   #3 (permalink)
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My bike, even after being ridden for hours dies if you suddenly change the position of the choke. I'm assuming you know/do this already... but sometimes the simple answer is the best. When the choke is fully on, give the bike some throttle (half rpm works), wait a second, and then move the throttle to off. Then let go of the throttle and it shouldn't stall
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Old 07-20-2009, 01:43 PM   #4 (permalink)
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Pilot jets are clogged. They're really tiny and any gunk that gets into them clogs them and/or the idle passageways.
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Old 07-22-2009, 06:34 PM   #5 (permalink)
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what is a pilot jet? and is it something that i should be able to clean myself or should i call a dealer to fix?
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Old 07-23-2009, 02:56 AM   #6 (permalink)
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With most carbureted applications you have what's called your "Main fuel circuit" or "Primary fuel circuit" and your "idle fuel circuitry". Since the throttle is mostly closed at idle fuel is not pulled from the main jet and introduced into the air stream, but introduced through a slot towards the front of the carburetor. It's just a little bit of fuel to keep the engine running really until you crack the throttle and more and more of the primary fuel circuitry can be used...

Just like the main circuit has a jet to meter the amount of fuel flowing through, the pilot jet meters the fuel that can be pulled through the idle circuit. It's literally a jet (just like the main jet), but a lot smaller.


I took this picture for something else, but the circle to the left is of the main jet. About 1/4" to the right of it is the pilot jet. That is what meters fuel for the idle fuel circuit.
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Old 07-24-2009, 03:34 PM   #7 (permalink)
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Had a similar problem with the GF's 08 ninja just yeterday. It sat for 2 weeks while we were gone. Went to ride yesterday, and it wouldn't stay running unless on full choke. We rode just a bit to see if it would "clear" up and idle normally. It didn't.

Changed the plugs, everything is back to normal once again. Now, I don't know if plugs are part of the 1st maintenance with these, but I do the work on it. Did the 1st oil change, lowered it, etc..

So, I'd suggest investing in 2 new plugs, (less than $10) and give that a shot.

If that's not it, run some seafoam in the tank, 1oz seafoam to 1 gallon of gas.
This will help clean up the carbs. It is possible the bowls need to be emptied, bad gas, or more. Start with the plugs, IMO.
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Old 08-03-2009, 10:23 PM   #8 (permalink)
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I had the same problem, got some sea form, rode it hard for 30 minutes and it fixed itself.
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