Question about 2007 Yamaha XT 125 X

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What height do you adust the float to in the carb . as it was adjusted wrongly when i had a fuel leak.

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Need to find the messurment in the repair manuel if you have one.

Posted on Sep 29, 2009


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I have a RM 125, the carb is leaking fuel out of the overflow. I checked the carb multiple times and also checked the float and needles. If anyone has suggestions to stop the leaking feel free to ask.

If it is leaking out of the overflow, then either the float is set for the wrong height of fuel in the bowl, or the needle that shuts off the flow is missing, or there is something stuck in the jet. The best thikng to do is to take it off the boike completely and strip it on a bench. You will need the workshop manual to check all the parts are there and to find the float height.

Wow, everything is in this manual! Section 4 - 2

Oct 06, 2016 | 2003 Suzuki RM 125

1 Answer

Why am I still getting fuel coming out of the over flow pipes ?

Hi, Nigel reset your float height to 21mm obviously thats not the problem and the other usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have nice a day.
How to adjust the Float Height on Carburetor Metric Harley and Asian
My carb leaks fuel out of the overflow hose at the bottom of my carb
Carburetor is leaking gas out of overflow tube need help

Mar 23, 2016 | Motorcycles

1 Answer

Whats wrong with my carb?

Hiya, two possibilities here firstly that your needle valve in the float chamber is stuck or leaking or your float height is set wrongly.

Jul 12, 2014 | Yamaha G1 G-1 2-cycle Gas Golf Cart Tune...

1 Answer


The Float adjustment usually involves carefully bending a tab against the needle valve where the fuel enters the float bowl. Since the float, "floats", there is no external adjustment. The float should close the valve at a specific height, and open as the fuel level drops, thus controling the level of fuel in the bowl, which in turn controls the amount of fuel being ingested by the carb. As for cleaning, any over the counter fuel system cleaning additive will help with that, from any auto parts store.

May 11, 2013 | Motorcycles

1 Answer

Yamaha v-star float bowl adjustment

No. Wrongly adjusted float height makes the engine fail to run.
If you get over flow leak (from the overflow hose) your fuel needle inside the carburetor simply does not close the gas supply hole firmly even if the floaters still pressing it against that hole.
That is because the over flow holes on a carburetor are so far above the floaters that even with the float height wrongly adjusted, the fuel needle should stop the gas from overflowing and simply made your fuel mixture too rich.

Oct 11, 2012 | 2003 Yamaha V Star 1100 Classic

1 Answer

Problem with starting my bike

Sticking floats or worn float valve needles or incorrect float height, tap float bowls to see it overflow stops (sticky float), remove and clean float bowls and fuel inlet passage with carb cleaner and compressed air, check float valve for wear to the rubber tip. Reset float height by slightly bending the metal tab on the float to adjust the closing height of the valve measure from the carb bowl mating surface to the top of the float when fitted then re adjust 1mm at a time higher untill fuel doesnt over flow.

Jan 25, 2012 | 1989 Yamaha FZX 750

1 Answer

Carburator leaks gas was from over flow on 1989 1200 sportster

float needle valve worn,floats can be fuel soaked causing the float needle valve not to close,may need float height adjustment,either case a carb clean rebuild will help.

Feb 10, 2011 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

We have a craftman snowblower...wont start ..I pull the cord and get nothing...changed sparkplug but still nothing .gas leaking from carbanator ...wont turn over/...what should I check?

A big problem you have is the gas leaking from the carb. This means your float that allows the right amount of gas in the bowl for everything to run right is either stuck or the float itself is leaking (heavier than it should) and therefore lets too much gas in the bowl. The float height is critical for proper running.
Remove the bowl. Look to see if nothing sticking like the inlet needle or float itself. Turn carb upside down to the float should be parallel to carb body.(different manufacturers specify different heights but adjusting the float parallel to carb body will run good.) Remove pin from float hinge to remove float. Check to see if the float is leaking, even just a small amount of gas in float makes it heavier and therefore lets in too much fuel. It can be difficult to see if it is leaking, shake back and forth to try to find out. If the float inlet needle or float itself is not sticking I suggest you get a new float. Adjust it to be level with carb body by bending the tang that sits on inlet needle. It should be pretty well level just as is.
I suggest you try that and see what happens. But as long as you have carb apart clean it with carb cleaner or paint thinners and blow air in all ports (low pressure air). How old is the gas in the tank? If over one year old use fresh gas. Try that and see what happens. If still problems I am willing to answer any of your questions. I hope this helps a little bit. Regards and good luck.

Dec 14, 2010 | Craftsman Garden

1 Answer

1979 dt 175 lower fuel overflow line is leaking gas until I start the bike, then it stops while the bike is running. When I shut the bike off the fuel starts running again till I shut off the gas. What...

Two possibilities.
1. Your float needle is leaking (most likely). Remove the carb, remove the float bowl. You will see the float itself and it has a tang that touches the float needle. Remove the float and inspect the needle and its seat for dirt or wear. You could try gently tapping the float bowl first, as this may dislodge and dirt, but thats a short term solution.
2. The float level is incorrect. You will need to bend the float tang to adjust. However, find out the float height for your bike first.

Jun 22, 2010 | 1974 Yamaha DT 360

1 Answer

Float hieght for 1984 IT 490

not sure of the exact height, but if you hold the carb level with fuel hose attached and pushing float up with finger, turn on petcok and slowly lower the float until it is just above horizontal. at this point, gas should start to flow out of the needle & seat.

if float turns off gas too soon, then engine will starve.

if float doesn't turn off gas, then it will flow out of the carb overflow tube.

Mar 14, 2009 | 1974 Yamaha DT 360

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