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  #1  
Old 03-13-2014, 11:12 PM
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Default whats wrong with my carb?

     

So today after taking my bike to fill the tank, i came home and the carb started leaking out of the overflow. I had this same problem just 1 day before, and took apart the carb, cleaned all the jets and everything, put it back together and had it running with no problems, took it out for a couple drives that day, then this happens when i came home from putting 1 liter in the tank , so once again, i took apart the carb, cleaned it all over again, and strapped her back on, she runs great, now im wondering what it was that caused it to overflow for the 2nd time, any suggestions as to what could have happend, or how to avoid having to take apart carb again?
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Old 03-14-2014, 12:52 AM
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i say adjust float height.
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Old 03-14-2014, 02:28 AM
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Ok....
No way to get around this without pulling that carb apart, this time get your wallet out and be prepared to replace the float needle.
You must inspect the float needle for signs of wear, usually an obvious is a ring around the cone shape portion of the float needle. If worn replace th float needle with a new one. Once done you might consider a new float as the density changes over time-of corse not really necessary but partially beneficial.
Having replaced the wear parts you can now set the all important float height. You can check out the thread about setting the float height on ATM in the knowledge section here.
Btw what bike???
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Old 03-14-2014, 02:44 AM
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its an italike dm 150, its mexican made, it runs ok, i replaced the factory rims and tires for bigger sized and mx tires, i put a front 21 and rear 18, it has taken alot of beating and is still great, i bent the part of the float that holds the needle to adjust the float( thats what i read here on ATM) and it seems ok now, but i guess it will take some more riding to tell if it worked, thanks guys, im was just wondering how it happend twice
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Old 03-14-2014, 02:49 AM
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DONT JUST BEND THE TAB. Without measuring you affect the fuel/air mix. It's best to set it to something. Forgot to mention that the float needle valve gasket could also be worn causing a leak ( it's just an O-Ring )
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Old 03-14-2014, 02:52 AM
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how do i measure? is that why when i try to give it gas on the low rpms it kind of feels like its going to shut off?

---------- Post added at 02:52 AM ---------- Previous post was at 02:50 AM ----------

it looks exactly like this
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Old 03-14-2014, 03:23 AM
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Yes it can bog down when you accelerate. You'll have to hunt down the specs for your carb. Then once you know the float height you can set that and fix the flooding issue. There are many adjustments for your carb, but stock should be fine.
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Old 03-14-2014, 03:34 AM
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how exactly do i find out what my specs are? its a dm150 2012 model
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Old 03-14-2014, 03:44 AM
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You get a manual for your bike silly!
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Old 03-14-2014, 08:04 AM
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You can check the float needle by taking off the float bowl, leave the hose from the gas tank connected, and turn on the gas (over a pan or bucket). You should be able to GENTLY press the floats up and the fuel should stop pouring out. There should be NO fuel coming out.

If I were you, I would just replace the float needle AND seat, since you have described a fouled up condition.

Do as was mentioned with the FLOAT HEIGHT. It differs from bike to bike, so you must get the manual or specs for you specific model.
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Old 03-14-2014, 01:15 PM
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so i have searched high and low for the specs, i went to the dealer, everything, i canot fidn them! is there a website i could check or any of you could give me a hand tracking them down?
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Old 03-14-2014, 08:36 PM
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The first thing to do is drain the fuel and clean the tank out. Chances are, if the carburetor is randomly overflowing, you are probably getting debris lodged in the fuel inlet. If you have dirt in the tank it wont matter how clean the carb is or how well the float level is set.
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Old 03-14-2014, 08:57 PM
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Quote:
Originally Posted by 351mustanger View Post
The first thing to do is drain the fuel and clean the tank out. Chances are, if the carburetor is randomly overflowing, you are probably getting debris lodged in the fuel inlet. If you have dirt in the tank it wont matter how clean the carb is or how well the float level is set.
Not bad advice, but I have a hard time seeing a 2 year old bike have that much dirt in the tank. Plus shouldn't the screen filter anything big enough to clog the float needle?
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Old 03-14-2014, 10:53 PM
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ive been riding it for about 2 maybe 3 hours, it hasnt overflowed yet, but it does feel very boggy, before installing the carb again, i unscrewd i think it was the fuel jet? not sure what its called ( the screw outside the carb on the side of the engine) i screwd it about half a turn out more, and i feel it very weird, and sounds very different, should i put it back to where i had it set before?

Last edited by spencerdm150; 03-14-2014 at 11:14 PM.
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Old 03-15-2014, 04:38 AM
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Once you make sure you are not getting dirt in the carburetor, clean the pilot jet. That is most likely where your low rpm bog is coming from. If you decide to adjust float height or mixture screws, it is a good idea to take note of the current settings. This way you can put everything back the way it was if no improvements can be made. Your motorcycle may or may not have a fuel filter (if it does it could be damaged) and I imagine you live in dusty conditions. I am not sure of the fuel quality in your area either. It is not that far fetched to have some dirt in your fuel tank. It won't cost anything to check it and it is the first link in the fuel circuit.
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Old 03-15-2014, 04:59 PM
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If gas is pouring out your overflow hose, it sounds to me like your float valve (float needle) needs replacement. They are almost always made out of a rubber viton tip that sits in the seat just under your float bowls. I would check that float valve and if you can see a little ring around where it sits in its seat, its time to replace.
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Old 03-16-2014, 02:09 AM
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so i had it happen again today, turned off the gas valve, and it started up afetr kicking her over a few times, and she ran until she ran out of gas, i then banged on the cabr a few times and it was fine for a while, untill it hapend again. the rubber tip looks new, what could be making the floats stick or what is my problem?
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Old 03-16-2014, 05:47 AM
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Dirt?
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Old 03-17-2014, 01:02 AM
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Quote:
Originally Posted by Randog Leader View Post
You can check the float needle by taking off the float bowl, leave the hose from the gas tank connected, and turn on the gas (over a pan or bucket). You should be able to GENTLY press the floats up and the fuel should stop pouring out. There should be NO fuel coming out.
Try that! It will tell you 100% if your float needle is sealing or not. If is seals when you do that your problem has to be float height. I really can't think of anything else that would cause that problem if it seals with that test. Definitely check for dirt. Those carbs are so easy to work on all these steps are a must.
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Old 03-17-2014, 02:11 AM
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im going to do that test with the carb open to see if the floats work, and then i guess like you say its gotta be the float height, i will let you know how it works out tomorrow
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