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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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  #1  
Old 10-28-2016, 12:34 PM
bikebro bikebro is offline
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Default Honda ghx50 Gas leaks from pcv

Someone please say the reason this honda engine is squirting a lot of gas out the pcv hole in the engine. The bike is running but there's a lot of gas spraying out. What do i do about this strange issue? thanks!
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Old 10-28-2016, 09:42 PM
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Agreen Agreen is offline
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Default Re: Honda ghx50 Gas leaks from pcv

As in fuel?!! Pictures!
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Old 10-28-2016, 11:35 PM
bikebro bikebro is offline
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Default Re: Honda ghx50 Gas leaks from pcv

hey man; thanks for the reply; yes! it's fuel that's spewing out of my engine; not spewing out of the carb but where the positive crank case vent hose from hole in the engine leads to the air breather. Fuel is basically pumping out of this port in the engine.
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Old 10-28-2016, 11:41 PM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: Honda ghx50 Gas leaks from pcv

Pictures would help.

Is this a pos crank vent valve seen from the area near the valves and have a hose that reroutes the oil fumes back to the airfilter on the carb to be burned?

Oil fumes not gas would be out the pcv.

There is the chance that worn intake valve has the seat and valve worn and clearance gap for timing is off. I've seen it where intake valve stays open too long a time. Then with compression stroke intake valve staying open too long will creature the same venturi effect and suck gas, but spray it the opposite way out the throat of the carb at the air filter. This is where it coud be gas going into the hose to the pcv.

MT
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Old 10-29-2016, 12:10 AM
bikebro bikebro is offline
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Default Re: Honda ghx50 Gas leaks from pcv

I'll try and send some pics in the morning; i must confer with my more knowledgeable friend as i have no idea what you said thanks and i appreciate you!
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Old 10-29-2016, 01:08 AM
Seabass Seabass is offline
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Default Re: Honda ghx50 Gas leaks from pcv

Ok what you got is a leaking needle and seat in the carb. The carb kinda works like a toilet, a float comes up and shuts off the flow of gas. Yours is leaking allowing gas to flow thru your intake into the cylinder and past the rings into your crankcase. Or into the intake an thru the intake valve guide. Either way not good.

Remove you carb bowl, remove the pin holding your float, now the needle and clip should come out with the float. Check to make sure your float is not full of gas. Install new needle and seat, check to make sure the float does not hit the top. if it's plastic a heat gun can be used to bend it back. put bowl back on!!

Now having a can carb cleaner while doing this is a good idea. Id even strip a piece of stranded wire and clean out all the little holes with it. Oh yeah change your oil!!!!

Hey there is a good small engine guy on YouTube....taryl fixes all..look for a guy with buck teeth and a mullet wig. Bare with the silliness this guy is clever and knows what he is doing.

Oh yeah when I do this to a carb i can usually do it on the machine.

Last edited by Seabass; 10-29-2016 at 01:12 AM.
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Old 10-29-2016, 05:32 AM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: Honda ghx50 Gas leaks from pcv

If what Seabass said is confirmed, I'd say to changed the oil frequently after fixing it. The metal can absorb gasoline into like pores in the metal. This thins out the oil. It would be best to clean the crankcase, but short of that, without opening the crankcase and cleaning and drying out what gasoline might be retained in the metal inside, changing the oil for a while frequently can help some.
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Old 10-29-2016, 10:04 AM
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Agreen Agreen is offline
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Default Re: Honda ghx50 Gas leaks from pcv

It's most likely not coming out of the PCV, but probably the overflow line. A lot of carbs have a bowl overflow line that gets routed up high. The idea is to allow a little wiggle room in bowl level when hitting bumps, but not enough to allow to force in the venturi of the carb. Anyway, Seabass is probably right. A picture would 100% confirm it.

Or your engine just may be completely full of gas. And that would be bad.
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Old 10-29-2016, 01:56 PM
bikebro bikebro is offline
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Default Re: Honda ghx50 Gas leaks from pcv

thank y'all for all the input. when i have time, i'll drain the oil/gas out and replace and hoping that when i crank it up that the vibrations would reseat the needle valve. if it don't then i remove the bowl and fix it that way. in the future i plan to shut of my fuel flow with an inline shutoff valve to keep this nonsense from happening again. once i get it lined out, i'll let yall know. thanks again
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Old 10-29-2016, 03:58 PM
Seabass Seabass is offline
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Default Re: Honda ghx50 Gas leaks from pcv

Check out that taryl fixes all on YouTube. This guy I great. Makes good videos and knows his shat. He has one about plastic floats and warping problems with them. It sounds like your problem.

Dont just change the oil and hope!!! Pinching off the fuel line and changing you needle and seat will take about 5 minutes. Its going to take you about the same time to change the oil. you can use jacks small engines.com for parts just watch out they are stupid about shipping!!!! I ordered 1 carb bowl oring, it came in a 6 by 6 by 6 box full of padding. They could have stuck it in an envelope and mail it for 50 cent not 7.95 shipping. Maybe you could find something local, or just someone smarter.com.

Last edited by Seabass; 10-29-2016 at 04:54 PM.
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