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Old July 14th, 2013, 02:10 PM   #1
Insan3guy
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Won't start after pulling carbs (solved!)

I took the airbox and carbs off yesterday to check them, the airbox was dirty as hell but the carbs were nice and clean. I removed the float bowl covers to check them and then put them back on; I didn't touch any of the parts inside.

I also put a new air filter in (old one was nearly completely disintegrated) and put everything back together and went for a ride. I drove 10 miles, came home, stopped the engine and tried to start it again but it wouldn't catch.

Now it won't start, except for one thing: When I turn the petcock to OFF, it starts right up, revs nicely for a couple seconds, and then dies about 4-5 seconds after starting it. Once or twice after doing one of those, it'll catch just a little bit and then die.

I don't know much about engines (yet) and my uncle says it could be that the air filter has too much oil in it (I already got as much as I could possibly get out, out) so I don't know.

Any ideas?

update: I have the gas tank off right now, and every time I let it sit for about 5 minutes it'll do the same thing as turning off the petcock mentioned above

Last futzed with by Insan3guy; July 17th, 2013 at 11:21 AM.
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Old July 14th, 2013, 03:10 PM   #2
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MOTM - Jun '18, Oct '16
Have you tried opening the throttle slightly as you crank it? Did you remove the covers from the idle mixture screws when you had the carbs off? You may need to make an adjustment to the idle mixture or idle speed.

Take the air filter out completely and see if it starts.

Check the vacuum hose to the petcock. Try it on reserve. How much fuel do you have in the tank, and how old is it?
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Old July 14th, 2013, 04:30 PM   #3
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tried opening the throttle 1/4, 1/2, 3/4, and full with no results.
idle mix screws have been set to 2.5 turns as per the instructions here http://faq.ninja250.org/wiki/How_do_...dle_mixture%3F

air filter in or out, no results
fuel in the tank is 2 days old, half full
petcock on res/on/off off is the only one that gives any results


update: pic of spark plugs attached
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Old July 15th, 2013, 06:30 AM   #4
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Looks like it is a little rich to me hard to tell but that's what it looks like I'd throw a new set of plugs in there and see if it will fire...
Also just keep in mind that when you pull and check plugs for spark even a fouled plug will fire outside cylinder... But once under compression it will not fire in cylinder......
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Old July 15th, 2013, 06:45 AM   #5
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MOTM - Jun '18, Oct '16
It's getting too much fuel for some reason - float level is too high, something stuck under the needle, or possibly the slides and diaphragm are hanging-up.

Look inside the carb throats and confirm the slides are sitting down all the way (not running). Take your finger and gently lift them and check that they rise and drop properly.

Also confirm that the enrichener ("choke") isn't stuck or hanging up in the "on" position.
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Old July 15th, 2013, 11:58 PM   #6
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could this be the problem?

Took off the carbs again, found this clear hose had been melted shut by the exhaust. What does it do/how could it affect the engine?
I also got a pair of new spark plugs (may as well), cr8hsa.
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Old July 16th, 2013, 09:14 PM   #7
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Well, that seemed to fix it. Runs like new, plus a new set of plugs and air filter.

I'm curious though, what purpose does that hose serve? ninja250.org calls it a "fuel overflow"
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Old July 16th, 2013, 09:16 PM   #8
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The melted hose is just your carb vent.. Just cut the end off that's melted it's basically just an overflow for your carbs... I'd double check everything in the carbs.. Float height.. Air screw .. And jetting to make sure everything is good in there
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Old July 16th, 2013, 09:19 PM   #9
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I'd deffinitly check your jetting and float height.. There is a reason those plugs are so black
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Old July 16th, 2013, 09:26 PM   #10
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Did all of that while I had them off the bike. clean as a whistle.
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Old July 17th, 2013, 07:12 AM   #11
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MOTM - Jun '18, Oct '16
Good to hear you got it solved!
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