jonway yy250t leaking fuel from carb while running

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jonway yy250t leaking fuel from carb while running by: rcapete007 - Jul 5, 2014 8:39:50 GMT -6

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Post by rcapete007 on Jul 5, 2014 8:39:50 GMT -6

I have a jonway 250cc scooter it has about 800 miles on it and ran fairly well all the time. I had an issue with cold starts and running rough until it warmed up but got through that. I was driving it about 2 months ago it ran good for about a mile then just started spitting and sputtering. It now became hard starting (only if I hold the throttle all the way open) and running rich after starting and I noticed gas running out of the carb when it is running. I changed the carb, changed the fuel pump and its still doing it. Any suggestions from anyone?

Bashan PM Bashan Bashan's Posts Bashan's Threads Forum Admin Currently Offline In Memory Rich Carman 1953 to 2015 RIP ScooterDoc Posts: 9,389 Likes: 301 Joined: Mar 29, 2010 18:33:42 GMT -6	jonway yy250t leaking fuel from carb while running by: Bashan - Jul 5, 2014 13:03:43 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Bashan on Jul 5, 2014 13:03:43 GMT -6 Where is the gas coming out of?

rcapete007 PM rcapete007 rcapete007's Posts rcapete007's Threads Clinician Currently Offline Posts: 18 Likes: 0 Joined: Jul 5, 2013 21:18:17 GMT -6	jonway yy250t leaking fuel from carb while running by: rcapete007 - Jul 5, 2014 19:02:04 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rcapete007 on Jul 5, 2014 19:02:04 GMT -6 the gas is coming out of the carb

Bashan PM Bashan Bashan's Posts Bashan's Threads Forum Admin Currently Offline In Memory Rich Carman 1953 to 2015 RIP ScooterDoc Posts: 9,389 Likes: 301 Joined: Mar 29, 2010 18:33:42 GMT -6	jonway yy250t leaking fuel from carb while running by: Bashan - Jul 5, 2014 19:32:03 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Bashan on Jul 5, 2014 19:32:03 GMT -6 Yes, I assumed that. Let's try another approach.

Alleyoop PM Alleyoop Alleyoop's Posts Alleyoop's Threads Forum Admin Currently Offline Posts: 13,815 Likes: 457 Joined: Mar 30, 2010 22:06:05 GMT -6	jonway yy250t leaking fuel from carb while running by: Alleyoop - Jul 5, 2014 19:41:36 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Alleyoop on Jul 5, 2014 19:41:36 GMT -6 OR from the Carb Drain which would normally have a hose on it and hanging down? Alleyoop
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rcapete007 PM rcapete007 rcapete007's Posts rcapete007's Threads Clinician Currently Offline Posts: 18 Likes: 0 Joined: Jul 5, 2013 21:18:17 GMT -6	jonway yy250t leaking fuel from carb while running by: rcapete007 - Jul 5, 2014 20:29:28 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rcapete007 on Jul 5, 2014 20:29:28 GMT -6 No I don't think its coming out of the overflow hose, I think its coming out of one of the other metal lines.
	Last Edit: Jul 5, 2014 20:32:37 GMT -6 by rcapete007

rcapete007 PM rcapete007 rcapete007's Posts rcapete007's Threads Clinician Currently Offline Posts: 18 Likes: 0 Joined: Jul 5, 2013 21:18:17 GMT -6	jonway yy250t leaking fuel from carb while running by: rcapete007 - Jul 5, 2014 20:36:29 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rcapete007 on Jul 5, 2014 20:36:29 GMT -6 It's definitely not coming out of the carb drain, it seems like its coming out the middle of the carb on the fuel inlet side, but not out of the overflow line.

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jonway yy250t leaking fuel from carb while running by: rcapete007 - Jul 5, 2014 20:39:49 GMT -6

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Post by rcapete007 on Jul 5, 2014 20:39:49 GMT -6

The float in the fuel bowl seems to be working properly when I disassembled one carb, but again the 2 carbs I had on there both did the same thing and 1 was the original carb and the other was a brand new one.

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jonway yy250t leaking fuel from carb while running by: Alleyoop - Jul 5, 2014 20:41:49 GMT -6

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Post by Alleyoop on Jul 5, 2014 20:41:49 GMT -6

The only other thing is the carb bowl is leaking there or you have a rip on the fuel hose attached to the FUEL INLET.

Well take a picture of that side of the carb. It is either the overflow, the drain, leaking by the carb bowl Gasket, or by the fuel inlet that is it there for that carb.
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tvnacman PM tvnacman tvnacman's Posts tvnacman's Threads Doc's Anything Goes Currently Offline Posts: 2,739 Likes: 66 Joined: Oct 23, 2010 19:29:21 GMT -6	jonway yy250t leaking fuel from carb while running by: tvnacman - Jul 5, 2014 20:42:54 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by tvnacman on Jul 5, 2014 20:42:54 GMT -6 how about the fuel hose at the the carb ?
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jonway yy250t leaking fuel from carb while running by: rcapete007 - Jul 5, 2014 20:47:19 GMT -6

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Post by rcapete007 on Jul 5, 2014 20:47:19 GMT -6

It might be running out of the carb barrel itself, seems like the fuel is loading up inside the barrel. What is the vacuum valve on the top of the carb? Does it operate the tube that slides down inside the barrel of the carb and if it does how is it suppose to work? I'm thinking because its happening to 2 different carbs, that one of the vacuum lines isn't opening something in the carb that's suppose to open to add more air and less fuel.

rcapete007 PM rcapete007 rcapete007's Posts rcapete007's Threads Clinician Currently Offline Posts: 18 Likes: 0 Joined: Jul 5, 2013 21:18:17 GMT -6	jonway yy250t leaking fuel from carb while running by: rcapete007 - Jul 5, 2014 20:50:29 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rcapete007 on Jul 5, 2014 20:50:29 GMT -6 It's not leaking out of any hoses the fuel inlet hose is intact and the gasket for the bowl is not leaking.

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jonway yy250t leaking fuel from carb while running by: Alleyoop - Jul 5, 2014 20:57:56 GMT -6

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Post by Alleyoop on Jul 5, 2014 20:57:56 GMT -6

The slide works with air coming into the venturi and it lifts the needle out of the main jet as you twist the throttle more air comes in and pressure lifts the slide. Are you talking about the SAUCER type piece by the top of the carb that is your acv valve It operates with vacuum so it does not run lean when you let go of the throttle.
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..BAD TO THE BONE..

PST150H 62mm BBK, 60mm Crank, 16/37 Tranny Gears............................................... MOW-POWER

FROM THE BOOK OF KNOWLEDGE:
THE THINGS YOU DO FOR YOURSELF ARE GONE WHEN YOU DIE, BUT THE THINGS YOU DO FOR OTHERS REMAIN AS YOUR LEGACY.

Bashan PM Bashan Bashan's Posts Bashan's Threads Forum Admin Currently Offline In Memory Rich Carman 1953 to 2015 RIP ScooterDoc Posts: 9,389 Likes: 301 Joined: Mar 29, 2010 18:33:42 GMT -6	jonway yy250t leaking fuel from carb while running by: Bashan - Jul 5, 2014 21:14:29 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Bashan on Jul 5, 2014 21:14:29 GMT -6 Can you not take a picture of where the gas is coming out of...or approximatetely....so that we are not guessing?

rcapete007 PM rcapete007 rcapete007's Posts rcapete007's Threads Clinician Currently Offline Posts: 18 Likes: 0 Joined: Jul 5, 2013 21:18:17 GMT -6	jonway yy250t leaking fuel from carb while running by: rcapete007 - Jul 5, 2014 21:17:47 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rcapete007 on Jul 5, 2014 21:17:47 GMT -6 I'll start it tomorrow and snap a pic when it starts leaking gas.