April 4th, 2012, 01:45 PM | #1 |
ninjette.org member
Name: Jen
Location: NYC
Join Date: Jan 2012 Motorcycle(s): 2010 Kawasaki Ninja 250 Special Edition Posts: 95
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Carb problem... dies when on the gas
I changed the carbs and it seems to run fine but as soon as I get on the gas it dies out. Has anyone run into this problem before? What do you think it could be? Throttle linkages? Maybe its not jetted correctly? It revs up fine with the choke on, as soon as I take the choke off it idles, but once I give it gas it dies out. Also, the top center of the carb has a fitting with a vacuum hose that goes to it. I believe it is just a hose just for overflow but can anyone confirm? Does anyone have any pics of the routing of the vacuum hoses? I think mine might be routed differently.. Below, I labelled where the hoses go on the carb I have.
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April 4th, 2012, 01:51 PM | #2 |
wat
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why did you change carbs? what jetting setup is in the carbs? what kind of intake/exhaust setup is on the bike?
it sounds like its not getting enough gas through the needle jet. maybe take them apart and clean the jets? maybe your petcock is clogged
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April 4th, 2012, 04:34 PM | #3 |
ninjette.org member
Name: Jen
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i changed the hoses to the way they were in this photo originally and that fixed the problem i guess there just want enough vacuum
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April 4th, 2012, 06:02 PM | #5 |
ninjette.org newbie
Name: Trevor
Location: Toronto
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similar problem
Hey,
I got my bike out of storage today and it started up with no problems. I rode it home from where it was stored (20km) and parked it. About 2 hours later I started it again with the choke on and let it warm up until the rpms were at 3k. When I closed the choke and gave it gas the bike stalled. This kept happening for about 10 minutes and then eventually it started to run fine. Tonight I had the exact same problem after starting. I really got rattled when I gave it gas turning left through the first instersection I went through and it stalled. Traffic had to stop. Every time I gave it gas the bike stalled. I opened the choke and rode out of the intersection. The problem went away after about 1km of riding. Does anyone have a guess as to why the bike is stalling when I give it gas? It seems to be fine after about 10 minutes of riding. Thanks for any advice you can give. *some background: I bought the bike (08 250r) used in the fall and put it away for the winter. The muffler is stock and the owner didn't mention anything about jetting the carbs.
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April 4th, 2012, 06:07 PM | #6 |
Super Noob
Name: Alex
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A bottle of seafoam is my usual remedy for anything carbs lol...I'd advice you to run some seafoam through them, before take the carbs apart to inspect/clean them.
Might also be a good idea to check the tubes (vaccum and fuel line) for obstruction and/or leaks. Good luck. |
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April 4th, 2012, 06:17 PM | #7 |
Internet Slut
Name: Jeff
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Isnt this what happened to kevins 250 at one point, It was like the diaprham or something was getting pinched.
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April 4th, 2012, 06:33 PM | #8 |
ninjette.org newbie
Name: Trevor
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Thanks for the advice guys. I'm pretty green when it comes to doing anything mechanical to my bike. I'll try the Seafoam. Based on a quick search, it will require removing the gas tank to get at the carbs?
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April 4th, 2012, 07:34 PM | #9 | |
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Quote:
If you are worried about the carb not drawing enough vacuum for the petcock, simply turn the valve to PRI and the gas will flow freely. |
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April 4th, 2012, 07:38 PM | #10 | |
ninjette.org guru
Name: Samual
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Quote:
http://www.ninjette.org/forums/showt...ht=efi+install |
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July 10th, 2012, 06:39 AM | #11 |
ninjette.org member
Name: Jen
Location: NYC
Join Date: Jan 2012 Motorcycle(s): 2010 Kawasaki Ninja 250 Special Edition Posts: 95
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Gas tank whistling..? And other weird issues
A low whistling sound has been coming out of the gas tank for a while now just sitting in the garage. Its a low whine that lasts a couple seconds, stops, and then happens again a few minutes later. I was told that this is due to a gas cap vent, and that as gas is used, the tank pulls in air and that if my vent is crap or broken it will continue to suck in air after the bike is off. However, I opened the cap and left it ajar for about half an hour, but once I lock it up again, the sound will keep happening. I'm really confused as to why this continues to happen, I'm not leaking any fuel.
Similarly, the bike has been running weird- I made a post about this a few months ago, but never was able to figure it out. The bike has been idling very high and bogging while letting out the clutch. I thought this was a carb issue, but I completely replaced the carbs with carbs a forum member sent me that were working perfectly, and the issue continued to occur Is there any chance these issues are related? What else could be causing my bike to run so strangely? Why would the gas tank keep whistling after I relieve the pressure and open it up? Thanks for your input and advice, I really appreciate it. Last futzed with by jboyd12; July 10th, 2012 at 10:58 AM. |
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July 10th, 2012, 07:06 AM | #12 |
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July 10th, 2012, 07:37 AM | #13 |
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So it has no relationship to my weird performance issues? And even after I open the gas tank the whistling will keep happening once it is shut. Not to mention that this is happening in all weather conditions, too. Not just the heat, this occurred all winter.
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July 10th, 2012, 07:48 AM | #14 | |
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Name: Naked
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The newer ninjettes come with little gnomes in the tank and they like to scream and whine when locked in the dark.
Sometimes their shoes do fall off and get stuck in your fuel lines - that may be the other problem. Quote:
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July 10th, 2012, 07:53 AM | #15 |
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The fuel in the tank is still cooling. Once the fuel is the same temp as the outside air, the noise stops. Idling speed is adjustable, just set it around 1500 rpm after the bike is fully warmed up (preferably, after a ride of at least 20 - 30 minutes to confirm that everything is fully up to temp). The bogging is hard to diagnose online, it's really hard to tell if it's a bike issue or a technique issue. If the new carbs are doing the same thing as the old carbs, and the new ones were confirmed OK, then it does seem less likely there's something wrong with the bike. Is there anyone nearby who knows these bikes well who could help troubleshoot it with you?
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July 10th, 2012, 07:59 AM | #16 |
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Seems there is also a vacuum line that if left off can cause high idle and poor performance. Double check all your connection again. A second person is also a good idea here as we all overlook things at times. A buddy may walk up to and say "hey... where does this line go?"
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July 10th, 2012, 08:44 AM | #17 | |
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Name: Jen
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Quote:
^That is the thread I made a while ago when I was troubleshooting, hopefully it explains my problem a little better. I really don't think it is a technique issue - my boyfriend who has been riding all kinds of bikes for a long time is the one who noticed the bogging Edit: This wasn't my original problem thread, not sure where that one went. This was just trying to get the carb on correctly, when my issues first occurred |
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July 10th, 2012, 08:45 AM | #18 | |
ninjette.org member
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Quote:
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July 10th, 2012, 09:56 AM | #19 |
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Yeah that would be it. Everything looks good though.
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July 10th, 2012, 09:59 AM | #20 |
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I'm trying to think what could be the issue that would not be a carb issue. If the problem remains the same with 2 different sets of carb's then I'm leaning away from a carb problem.
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July 10th, 2012, 10:07 AM | #21 |
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July 10th, 2012, 10:08 AM | #22 |
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tank whistling is from the vents on the gas tank, as the fuel gets hot, it releases gas, and \\kawasaki made the vents too small, there are mods out there to open up the vents with dremel
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July 10th, 2012, 10:09 AM | #23 |
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Jen do you have the means to get us a small video of the symptom so we can hear it? Can it be duplicated easily so it can be recorded?
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July 10th, 2012, 10:10 AM | #24 | |
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Quote:
Alex: Should we merge?
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July 10th, 2012, 10:16 AM | #25 |
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Not sure what you mean? Like you said, I thought we were past the tank whistle? I can try to get a video of the high idling / bogging if you'd like later when I'm home, if thats what you were referring to
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July 10th, 2012, 10:20 AM | #26 |
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Yeah the bog is what I'd like to hear. Before you record the bog though, let's try to lower the idle with the idle set. Are you familiar with it's location and use??
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July 10th, 2012, 10:24 AM | #27 |
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I found a few youtube vids of people doing it, I should be okay. I'm sure my boyfriend knows how. I'll see if we can get a video of it when we get out of work. Thanks for your help
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July 10th, 2012, 10:42 AM | #28 |
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/merged 'em to keep the troubleshooting steps together for the more serious problem. Hope a fix is found soon!
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July 10th, 2012, 10:59 AM | #29 |
ninjette.org member
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Thanks, but it doesn't die on the gas anymore, that issue was fixed! Just a strange performance problem now, with bogging, not like when I started the thread.
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July 10th, 2012, 11:06 AM | #30 | |
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Quote:
History: What mods have been done? Has the bike been stored for any extended periods recently? Concerns: The bike runs but idles high. It bogs as it accelerates from a start but doesn't die. Any other concerns since the whine is normal?
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July 10th, 2012, 11:23 AM | #31 | |
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Quote:
Concerns: you said it perfectly, from what I understand. I can have my boyfriend explain it better later but he told me its like a bogging as you let out the clutch, and it runs like crap as well as idling high. But the bike does run. This thread was from when I swapped the carbs to solve the original problem. The problem described in the thread - the gas cutting off - was due to a mismatched hose, as you can see from my response earlier |
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July 10th, 2012, 11:37 AM | #32 |
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Ok. Sounds good.
I'd also like to know if the bog is only accelerating from a stop or does it bog at a particular rpm in every gear? I look forward to reading his description.
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July 10th, 2012, 05:01 PM | #33 |
ninjette.org member
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Bike only dies on the gas occasionally when leaving first gear. You have to rev it high and slip the clutch when you let it out or else it will die. there are idling issues in which the bike will warm up at a rather high idle then will idle down to standard / "normal" idle around 1,000 but if you ride the bike it will be very sluggish and boggish between 1 and 6 thousand rpm and then it will start pulling when its supposed to. you can stop the bike and it will idle at 1000rpm and if you rev it it will hang at about 4k for an excessive period of time, like a couple minutes, not even seconds. I've cleaned the carbs and swapped them out with perfectly good ones, i figured it was something with vacuum lines or the petcock on the gas tank. any help would be greatly appreciated before i take it to a shop and get owned
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July 10th, 2012, 05:09 PM | #34 |
ninjette.org member
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The idle isnt set high, its set to 800-1000 rpm it will randomly rev up and hold an idle of 3-4k for an extended period of time, and then it goes back down. its inconsistent
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July 11th, 2012, 04:38 AM | #35 | |
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Quote:
Overall though it sounds as if the bike is running poorly on the bottom part of the rpm range. To me this still screams jetting and/or pilot screw settings. Do we know if the carbs you bought were jetted or shimmed? Here's a great chart that shows us what does what inside the carbs just you have a better understanding. Also understand that this may take some time to diagnose and each of us at some point have to decide whether we want to take the challenge on or let a pro handle it. That decision would be yours. I'm sure with the help of others on here we can resolve this though.
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July 11th, 2012, 05:10 AM | #36 | |
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Quote:
I believe the carbs were stock jetting. I figured I might as well post here and see if you guys had any major ideas or recommendation for troubleshooting it myself before bringing it somewhere... but it seems like it might just have to come down to that. Thanks for the pic. And thanks for your help, I really appreciate your willingness to listen to my concerns and help me out with diagnostics. |
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July 11th, 2012, 05:40 AM | #37 |
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No problem, that's what we are here for.
Let us know what the final resolution is. I'd love to know. Hopefully it's not something like a pinched fuel line or a clogged air filter (or aliens). lol
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July 11th, 2012, 06:21 AM | #38 | |
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Quote:
Sorry if that's already been suggested and tested, I might have missed it in all those posts. Posted via Mobile Device |
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July 11th, 2012, 06:25 AM | #39 | |
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July 11th, 2012, 09:45 PM | #40 | |
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Quote:
If you feel like playing with the Jetting/Shimming of the needles, I do have a spare Dynojet stage 2 kit, this will let you remove the snorkel or upgrade to a k/n setup, probably make your bike much better. |
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