Carbs overflowing, but not overflowing

LasseNC · 10-02-2012, 03:13 AM

Hello!

My new T500 is acting a bit weird. When it is on the sidestand, and I take it off the stand, petrol will run out. If I then put it back on the sidestand, petrol will come out again.

So every time, it is being tilted or raised up, petrol is coming out.

So I guess it is carbs off float bowl clean and the needle area.

What else?

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lrutt · 10-02-2012, 04:35 AM

where exactly is it coming out??? There is a drain hole through the crank case possibly, if like tye T250, where gas can accumulate on top of the motor and when moved could drop down to the bottom. Same with Gas accumulating in the air box.

So you could just have a leaking float boal drain plug, leaking fuel line, as well as possible float / needle problems.

LasseNC · 10-02-2012, 09:04 AM

It it coming out of the plastic tube, which is connected to the floatbowl.

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2stroke_junkie · 10-02-2012, 09:05 AM

From my experiences I say change the needle and seat. I had that problem on my 89 KTM 350

Twin-shocker · 10-04-2012, 12:21 AM

Check that the floats arent porous

anonny · 10-06-2012, 09:58 AM

Quote:

Originally Posted by Twin-shocker

Check that the floats arent porous

and float height is correct.

victor441 · 10-06-2012, 10:43 AM

also carry a fire extinguisher until you get it fixed, I had a new to me bike catch fire that way and I was very lucky to be able to put it out with my gloves before I lost it

some of the overflow gas was ignited by the alternator wires. FWIW in my case the PO had installed new floats and they were a bit too wide at the pivot, no more overflows after I filed them a bit

Uncle Pollo · 10-09-2012, 08:06 AM

Shoot carb cleaner through the carb fuel intake tube. It usually cleans out the float nerdle and seat area. Try that before cleaning the whole thing.

killfile · 10-09-2012, 05:07 PM

Is this while the bike is running, or not running?
If it happens while it is running, check needles/seats and float heights as previously mentioned.
if it happens while it is not running i would suspect the needles and seats, but your vacuum petcock might also be bad.

what year t500 did you end up getting? is there a picture thread yet?

actually after re-reading your thread, how much gas is coming out? is it constant or just a small amount after the tilt? starting to sound like the float level is just a little off.

10-02-2012, 03:13 AM	#1
LasseNC ^OP XSessive! Joined: Jan 2008 Location: Denmark, Danimarka, Danmark, Dänemark Oddometer: 946	Carbs overflowing, but not overflowing Hello! My new T500 is acting a bit weird. When it is on the sidestand, and I take it off the stand, petrol will run out. If I then put it back on the sidestand, petrol will come out again. So every time, it is being tilted or raised up, petrol is coming out. So I guess it is carbs off float bowl clean and the needle area. What else? Sendt fra min GT-S5690 med Tapatalk2

10-02-2012, 04:35 AM	#2
lrutt SILENCE.....i kill you Joined: Jul 2005 Oddometer: 796	where exactly is it coming out??? There is a drain hole through the crank case possibly, if like tye T250, where gas can accumulate on top of the motor and when moved could drop down to the bottom. Same with Gas accumulating in the air box. So you could just have a leaking float boal drain plug, leaking fuel line, as well as possible float / needle problems. __________________ 2004 Harley Sporster 1200C, 2001 Ducati M900, 2001 Honda XR650L, 1994 Harley Heritage, 1978 Honda CB750K with sidecar, 1977 Moto Guzzi 850 LeMans, 1976 Honda CB750K, 1965 Honda 305 Dream, 1973 Norton 850 Commando, 1971 Triumph Trophy 650, 1970 Honda Trail 90, 1970 Triumph Tiger 650, 1973 Honda Z50, 1984 Yamaha Virago 1000, 1981 Honda Passport 70, 1970 Suzuki T250, 1971 Yamaha RT1 360

10-09-2012, 08:06 AM	#8
Uncle Pollo Von Hochstaden's son Joined: Jun 2006 Location: Albuquerque, Neue Messico Oddometer: 44,977	Shoot carb cleaner through the carb fuel intake tube. It usually cleans out the float nerdle and seat area. Try that before cleaning the whole thing. __________________ mikuni vm32-33 both sides :\ 5000 feet altitude/ 140 main \ 159 02 needle jet\ 6F4 needle in the middle setting\ 0.5 air jet\ pilot 25/3.0 slide 35 mpg around town riding like a asno

10-09-2012, 05:07 PM	#9
killfile 49/50 Joined: May 2010 Location: SF, CA Oddometer: 353	Is this while the bike is running, or not running? If it happens while it is running, check needles/seats and float heights as previously mentioned. if it happens while it is not running i would suspect the needles and seats, but your vacuum petcock might also be bad. what year t500 did you end up getting? is there a picture thread yet? actually after re-reading your thread, how much gas is coming out? is it constant or just a small amount after the tilt? starting to sound like the float level is just a little off. __________________ Gallery MotoSF & Neoedo

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10-02-2012, 09:04 AM	#3
LasseNC ^OP XSessive! Joined: Jan 2008 Location: Denmark, Danimarka, Danmark, Dänemark Oddometer: 946	It it coming out of the plastic tube, which is connected to the floatbowl. Sendt fra min GT-S5690 med Tapatalk2

10-02-2012, 09:05 AM	#4
2stroke_junkie n00b Joined: Oct 2012 Location: Waterbury, Connecticut Oddometer: 4	From my experiences I say change the needle and seat. I had that problem on my 89 KTM 350

10-04-2012, 12:21 AM	#5
Twin-shocker Studly Adventurer Joined: Jan 2012 Oddometer: 993	Check that the floats arent porous

10-06-2012, 10:43 AM	#7
victor441 Gnarly Adventurer Joined: Jul 2009 Location: Santa Rosa, Calif. Oddometer: 460	also carry a fire extinguisher until you get it fixed, I had a new to me bike catch fire that way and I was very lucky to be able to put it out with my gloves before I lost it some of the overflow gas was ignited by the alternator wires. FWIW in my case the PO had installed new floats and they were a bit too wide at the pivot, no more overflows after I filed them a bit