June 2nd, 2017, 05:59 PM | #1 |
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Bike won't start... sometimes
My 05 ninja 250 starts every once and a while. Once I get it running and shut it off it has a hard time starting up again. Carbs are definitely clean, recent oil change, new spark plugs. Anyone have any ideas?
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June 2nd, 2017, 07:51 PM | #2 | |
Rev Limiter
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Quote:
How old is the gas? |
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June 2nd, 2017, 08:30 PM | #3 |
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Not very old and everything is synced. Didn't change anything since it was running last time
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June 2nd, 2017, 08:32 PM | #4 | |
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Quote:
How long ago are we talking?
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June 2nd, 2017, 08:33 PM | #5 |
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Couple weeks maybe a month
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June 2nd, 2017, 08:47 PM | #6 |
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The first thing I'd do is see if I have spark when it won't start.
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June 2nd, 2017, 08:50 PM | #7 |
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Like Jim says, check your spark. Or maybe a vacuum leak, cracked hose, or cracked intake (the rubber manifold between carbs and engine), I've had them split under the clamps closest to the engine, making it hard to start and run poorly at low engine speeds. When I found a crack under the clamp I took the clamp out of the way and wrapped electrical tape around a couple times then replaced the clamp over it.
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June 2nd, 2017, 09:25 PM | #8 |
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I know I have spark. The vacuum leak is a good idea!
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June 3rd, 2017, 05:14 PM | #9 |
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Could it possibly be a glogged air filter?
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June 3rd, 2017, 05:28 PM | #10 |
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I suppose, but it would have to be REALLY bad, (like a mouse nest, guess how I know that) it would be like the choke on all the time.
PS: even with the mouse nest it would start and idle fine.
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June 3rd, 2017, 05:33 PM | #11 |
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It takes only a minute to look at the filter and see if it's clogged.
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June 5th, 2017, 10:24 AM | #12 |
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What about mixture screws? Could my mixture be off too much?
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June 5th, 2017, 10:30 AM | #13 |
Rev Limiter
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What are they set at now?
2.5 turns out is the standard baseline, and should be very close. Fresh gas is a must. If there's any question you should completely drain the tank and floatbowls. Gas goes bad even if it's not that old. It's a big variable, and the first thing I always consider when a problem arises. |
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June 5th, 2017, 02:59 PM | #14 |
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Put in fresh gas. Tightened the boots and checked the air filter and now it won't even start.
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June 5th, 2017, 03:01 PM | #15 |
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And you definitely have spark, right? If so, I'd say your pilot circuits are clogged.
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June 5th, 2017, 03:06 PM | #16 | |
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Quote:
That drains a battery pretty quickly, so it will need most likely need a charge. If you still get nothing, pull the plug wires and check for a spark. If you have spark, you can remove the air filter and give the carbs a quick shot of starter fluid. If it fires up momentarily it tells you for sure you don't have fuel. Just don't use much. It will pop over from just a quick shot. |
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June 5th, 2017, 03:27 PM | #17 |
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Sprayed a tiny bit and it started! I checked the float bowl and there is fuel in them. Checked the jets and cleaned the whole carb. Still nothing
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June 5th, 2017, 03:46 PM | #18 |
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My bet is on clogged pilot circuits, no matter how many times you say the carbs are clean.
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June 5th, 2017, 07:11 PM | #19 |
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^^ what he said^^, not just the jets but the passages inside the carb also and maybe the enriching (choke) circuit also.
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June 5th, 2017, 07:46 PM | #20 |
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I pulled the carb and the pilot jets and sprayed cleaner through the passages. The carb cleaner went through no problem so i dont think they are clogged
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June 6th, 2017, 06:37 AM | #21 |
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How about the idle mixture passages? Did you remove the screws and make sure the passages are clear?
Have you confirmed the idle mixture screws have o-rings in good shape? They can tear and block the passage. The screws should be set to 2.5 turns out as a baseline. You have confirmed that the issue is with the carbs/fuel, so that's a good start to solving the problem. |
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June 6th, 2017, 02:39 PM | #22 |
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Pulled everything again. One mixture screw is missing an outing. Would that cause the problem? All the passages are clear. I can spray through all of them no problem
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June 6th, 2017, 05:18 PM | #23 | |
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Quote:
Yes - not having an o-ring would cause problems. It needs to go together like this - https://faq.ninja250.org/images/9/9a/BC_cleaning_4.jpg |
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June 6th, 2017, 06:08 PM | #24 |
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What kind of problems would I see. I don't see washers on either or an o ring on 1 and can't see them in the hole
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June 6th, 2017, 08:35 PM | #25 |
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the O-rings seal the needles so you don't have a vacuum leak, and the washers protect the O-rings from the springs.
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June 6th, 2017, 09:58 PM | #26 |
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Do I have to get the o ring and washer from the dealer or can you get them from like home depot or a place like that?
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June 7th, 2017, 04:58 AM | #27 |
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Inspect and probe the pilot screw orifice carefully...possible they are still in there?????
I keep orings and washers in stock, standard procedure within my carb service. There are metric, extremely tiny...doubtful you'll find local. PM me if you need....but make sure they are, in fact, MIA first!
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June 7th, 2017, 06:44 AM | #28 |
Rev Limiter
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June 7th, 2017, 07:48 AM | #29 |
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Would these missing be the cause to my problem?
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June 7th, 2017, 07:52 AM | #30 |
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June 7th, 2017, 08:35 AM | #31 |
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The Keihin factory chose to install the orings to seal that section of the pilot chamber from introduction of false air....thus assuring precise pilot screw metering. This, assuming the rest of the pilot circuit is, in fact, clear.
Will this cure your hard starting issue? Likely a contributing factor...when critical parts are found missing, its imperative to correct...what may seem trivial (the insignificant, tiny little oring) is in fact, quite important in the role that it plays. Troubleshooting includes a process of elimination. As JKV correctly posted....replace the parts (washers too) ...set the screws at 2.5 starting position. You should then fine tune each side and reaccess starting situation.
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June 8th, 2017, 09:18 AM | #32 |
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I have been talking to a friend of mine and he says the rings could be shot. Is that a possibility or would it not start at all even with a tiny bit of starting fluid?
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June 8th, 2017, 10:54 AM | #33 |
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An easy to do compression test will tell you the condition of your rings.
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June 8th, 2017, 03:13 PM | #34 |
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If rings are shot, it won't run with starting-fluid. Just fact that it runs on starting-fluid shows you're not getting fuel out of carb into engine.
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June 9th, 2017, 04:29 PM | #35 |
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Can get it to start on starting fluid but only will stay started on choke. But can't really rev it at all
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June 9th, 2017, 08:08 PM | #36 |
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The thread has discussed carb cleaning, carb synch fresh fuel, spark plugs, vac leaks, air filter, pilot screws with missing orings, battery, plug wires, jets , compression testing.
You've summarily proclaimed everything is ok....but fact remains, it will run temporarily only using starting fluid ....indicative of internal carb issues...consistently suggested by 3 or 4 of us within the thread.
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