Question about 2003 Suzuki RM 250

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Gas leak from carb drain hose

I have this problem on my son's RM85 '03, suddenly qhen he opens the gas valve at the thank, gas goes out from the hose coming from bottom of carb, any clues ?
Thank you in advance for your help

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  • ljoe Jan 07, 2009

    Thank oyu Alcatrazx for your quick response, and yeah you are right, Ihave to be more specific, we shut off the gas valve after every ride and suddenly when I was getting the bike ready for a ride, open the gas valve and gas was comming out of the mentioned hose without stopping, and every time I open the gas, there goes the same problem, even without touching the throtle, just by opening the valve, this happened about a month ago and I haven't been able to ride it due to this, it sounds weird, but I'm pretty sure being a pro, you know what's going on.

    thank you again

  • ljoe Jan 08, 2009

    thank you for your help, I will work on it and try to get him back on riddin'


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I had this same problem on my DRZ-110.
I took apart the carburator to clean everything out, but when i re-assembled it it started to leak gas out of the drain hose. Then i found out that the problem was that one of my gaskets were torn and were letting air in the drain which prevents it from being a vacuum, therefore causing gas to leak out.
I would first check the float & make sure it isnt stuck, then i would check all of the gaskets and make sure they arent torn, & replace the ones that are, even if theyre slightly damaged they can still let in air.
Your carb has to be 100% sealed & vacuumed to prevent any leaks & for it to work fine, so get those gaskets checked out

Posted on Jul 28, 2009

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If your float, that's in the bowl of the carburator is sticking, it won't "float" as the fuel fills the bowl and never stop the fuel from entering, causing it to run out the overflow vent hose. The float is what regulates the amount of fuel that goes into the carburator bowl. You can try to tap it with a screw driver handle to see if it might stop while it's doing it.

Posted on Jul 31, 2009

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Your carb works a bit like the rank behind a toilet. The fluid (gas or water) comes in, float goes up, which pushes a valve shut, fluid stops.

If this "just happened" you very possibly have a bit of dirt blocking the valve (easy fix). You could also have a stuck float or even a flooded float.
One word of advice: try not to disassemble the carb over gravel or dirt - there are small parts that can fall out. Also, unless you understand how carb mixtures work do not mess with the adjustment screws other than the idle adjust.

Posted on Sep 10, 2014

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If i got you right, this will always happen if the pipe is lower than the carb its a syphon effect so it will always happen. You either have to place your question more specifically because as such there is nothing wrong with that.

Hope that I was of help :)

Posted on Jan 07, 2009

  • Alcatrazx
    Alcatrazx Jan 07, 2009

    Hi There

    From what i get, this is a kids' bike. If the gas keeps coming out it means that there must be a crack somewhere. The reason being that there must be some air coming through because the fuel keeps coming and its not stopping. You will be required to check from the tank cap all the way down to the hose joints to the valve itself as there should be a crack somewhere preceeding the valve. If the valve itself needs to be replaced i reckon it might cost about $45 to replace and might be more handy to replace it with some improved ones from the 08 model. Hope that this was of help to you :) for plastic parts if they are cracked such as tank cracks etx you can use epoxy-like glue where as for metal clips and pipes they can easily be replaced with new ones. Hope you get biking about soon :)

    Best Regards


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