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Old 04-02-2015, 07:23 PM   #1
z0sum
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bike sounds/run/idles like

Turned on the bike today, was a little hard to start and was not idling. Tried to ride it and had no power, felt like the bike was barely getting any gas, but the tanks nearly full. Pretty much has no power and the bike was hardly running. after a while it wouldn't even idle no more, just bogs down and die.

Last time i rode it was completely fine, any ideas?

Didn't really see any smoke or spills.
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Old 04-02-2015, 07:55 PM   #2
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When was the last time you rode it?
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Old 04-02-2015, 08:09 PM   #3
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When was the last time you rode it?
3 days ago.
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Old 04-02-2015, 08:14 PM   #4
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Hmm. Usually the symptoms you describe on that '08 Ninja 250 (that is the bike we're talking about, correct?) indicates clogged pilot jets, but that normally only happens if the bike sits up for weeks or months without being ridden. Other than 3 days ago, has the bike been ridden regularly?
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Old 04-02-2015, 08:37 PM   #5
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It just did it's first track day on the 28th. I even rode it in the pits. Nothing seemed wrong at the time...
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Old 04-02-2015, 08:43 PM   #6
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Yea did a track day this past Saturday, rode it a couple times after, everything was fine. Start it up this evening to ride, and it's all out of whack. I've been riding it regularly.
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Old 04-02-2015, 10:04 PM   #7
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Well, without more information it's difficult to diagnose. The only advice I can really give is to troubleshoot the basics Air/Fuel/Spark. Fortunately, that bike is carbureted so it's a little more straight-forward than if it were fuel injected. If it were my bike I'd check these things next in the following order (of difficulty to get to/work on).

Air: Check your air filter element and clean and re-oil or replace (if it's the stock foam one). If the stock one has been replaced with a K&N filter it can be cleaned and re-oiled too. If it's got a folded paper type, replace it with a new one. Double check there is no debris or other hungus in the air box that has some how made its way past the filter. If the bike still has the snorkel on the air box, check it for obstructions.

Fuel System:

Check for vacuum leaks (cracked, dry rotted, or leaking vacuum lines, etc.). If there are any rubber vacuum caps on the carbs, check them too. Your bike has a vacuum actuated fuel petcock, so if it's not receiving vacuum, it doesn't open all the way or not at all, hence no/not enough fuel. Check the vacuum hose to the petcock.

Electrical:

Make sure you're getting strong consistent spark and that the plugs aren't fouled or corroded. If you don't have good spark, check the coils, rectifier, stator, etc.

More Fuel System:

You may still have clogged jets in the carbs. Clogged pilot jets usually cause the bike to idle rough or not at all, or generally act 'cold blooded'. If the bike runs once up off idle (it may still be rough), I really suspect this is your problem. Problem is, you can't tell for sure unless you've eliminated the other things above and you've taken the carbs out and have them apart. If you end up pulling the carbs, it's best to do a full break down and thorough soak and clean since it's a giant pain in the and you don't want to do it twice if you do it half way the first time.

That's probably enough to get you started. And not to send you off to another board, but ninjette.org is a wealth of information on everything Ninja 250 related.

Good luck...
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Old 04-03-2015, 04:10 AM   #8
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Quote:
Originally Posted by z0sum View Post
Turned on the bike today, was a little hard to start and was not idling. Tried to ride it and had no power, felt like the bike was barely getting any gas, but the tanks nearly full. Pretty much has no power and the bike was hardly running. after a while it wouldn't even idle no more, just bogs down and die.

Last time i rode it was completely fine, any ideas?

Didn't really see any smoke or spills.
Does the voltage regulator get hot?
If you jump it, does it die when you remove the cables?
Put a VOM across the battery and see if its charging.
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Old 04-03-2015, 10:54 AM   #9
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I have 2 of them! On my bikes the bowl in the carbs tend to get stuck... usually its easy to grab a screw drive and knock under the cabs to get them loose again. In a couple of times I had to unscrew the the little crew under the carb and drain it completely. After that I sprayed start fluid in the carbs and the bike went back working as usual.
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Old 04-03-2015, 11:26 AM   #10
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Has the bike been ridden in the rain or is it stored outdoors? I had these problems when my bike got rained on real good sitting in the office parking lot, apparently my gas cap gasket isnt water tight and I got water in the gas.
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Old 04-03-2015, 02:46 PM   #11
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Well I did absolutely nothing from yesterday 'till today and I start it up and all of a sudden everything's fine again. I'm suspecting that water got in somewhere it wasn't supposed to be. I remember when I straightened my bike off the stand, I heard a sound like water fell somewhere but I looked down and saw nothing. I thought it was in my head but now that the bike's fine I'm guessing it got in somewhere but now it's dried.
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Old 04-03-2015, 02:48 PM   #12
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Quote:
Originally Posted by Texascanuck View Post
Well, without more information it's difficult to diagnose. The only advice I can really give is to troubleshoot the basics Air/Fuel/Spark. Fortunately, that bike is carbureted so it's a little more straight-forward than if it were fuel injected. If it were my bike I'd check these things next in the following order (of difficulty to get to/work on).

Air: Check your air filter element and clean and re-oil or replace (if it's the stock foam one). If the stock one has been replaced with a K&N filter it can be cleaned and re-oiled too. If it's got a folded paper type, replace it with a new one. Double check there is no debris or other hungus in the air box that has some how made its way past the filter. If the bike still has the snorkel on the air box, check it for obstructions.

Fuel System:

Check for vacuum leaks (cracked, dry rotted, or leaking vacuum lines, etc.). If there are any rubber vacuum caps on the carbs, check them too. Your bike has a vacuum actuated fuel petcock, so if it's not receiving vacuum, it doesn't open all the way or not at all, hence no/not enough fuel. Check the vacuum hose to the petcock.

Electrical:

Make sure you're getting strong consistent spark and that the plugs aren't fouled or corroded. If you don't have good spark, check the coils, rectifier, stator, etc.

More Fuel System:

You may still have clogged jets in the carbs. Clogged pilot jets usually cause the bike to idle rough or not at all, or generally act 'cold blooded'. If the bike runs once up off idle (it may still be rough), I really suspect this is your problem. Problem is, you can't tell for sure unless you've eliminated the other things above and you've taken the carbs out and have them apart. If you end up pulling the carbs, it's best to do a full break down and thorough soak and clean since it's a giant pain in the and you don't want to do it twice if you do it half way the first time.

That's probably enough to get you started. And not to send you off to another board, but ninjette.org is a wealth of information on everything Ninja 250 related.

Good luck...
Thanks for this man, even though my bike's running fine again I still just want to do all this just to keep my bike in tip top shape. I'm at a little over 16k and haven't cleaned the carbs yet so that's probably almost due. Showing no signs yet but best to do it before any signs show up.
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Old 04-03-2015, 03:28 PM   #13
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Go pickup a can of Seafoam, add 1 ounce per gallon and run a tank of premium thru it.
That should help degunk the carbs and also flush any bad gas out.

Todays ethanol mixes leave all sorts of in the carbs and jets; Seafoam works excellent at cleaning it all out.

My old Bandit had small pilots, and if it sat even a few weeks it ran like . Regular Seafoam kept it clean and ready to ride whenever.
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Old 04-04-2015, 06:20 PM   #14
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Was taking it out to ride today, everything was fine for a little while, but it seemed as the longer I rode, the worse the bike was running. It started with the idle just being weird and sort of bouncing, then just going lower and lower and eventually dying. It'd ride alright for a little while then again start running worse, I just brought it back and parked it because it eventually stopped idling at all and started running just as bad as it it was running before to where it sounded like it just wanted to die.
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Old 04-04-2015, 06:28 PM   #15
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Quote:
Originally Posted by z0sum View Post
Was taking it out to ride today, everything was fine for a little while, but it seemed as the longer I rode, the worse the bike was running. It started with the idle just being weird and sort of bouncing, then just going lower and lower and eventually dying. It'd ride alright for a little while then again start running worse, I just brought it back and parked it because it eventually stopped idling at all and started running just as bad as it it was running before to where it sounded like it just wanted to die.
I would rejet the carbs. While you have them out might as well change the main jets. I went with Dynojett stage 2. For street riding I have +2 & -3 on the sprockets.
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Old 04-04-2015, 07:12 PM   #16
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Old 04-04-2015, 07:25 PM   #17
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I would rejet the carbs. While you have them out might as well change the main jets. I went with Dynojett stage 2. For street riding I have +2 & -3 on the sprockets.
So it's the carbs, then? They need to be cleaned?
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Old 04-04-2015, 07:39 PM   #18
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So it's the carbs, then? They need to be cleaned?
Yes Sir! Also need to be balanced. And at 16k valves need to be checked. The manual says to check the valves every 7K. The exhaust valves are probably tight which = loss of power after the engine warms up. Happened to mine.
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Old 04-04-2015, 07:43 PM   #19
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Old 04-04-2015, 07:45 PM   #20
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