2004 Yamaha YZ 125 Logo
Posted on Mar 28, 2009

Won't start leaks gas and oil

My 87 YZ125 won't start for me. as soon as i turn the gas on it all leaks out from the float bowl. the float is not stuck i checked it and replaced the O-ring on it, but it continues to just leak all the gas out. it's like the gas isn't even reaching the cylinder because the plug isn't wet. it's also leaking all it's gear oil and engine coolant from a brand new clutch cover gasket. it didn't do any of this before winter!

  • Anonymous Mar 19, 2014

    When starting bike in winter,came back and found coolant leaking out to drain plugs

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1 Answer

Keye Hernandez

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  • Posted on Mar 28, 2009
Keye Hernandez
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Joined: Mar 28, 2009
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Maybe try changing the float. It may be filling with gas which means it can't float.

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Ensure clean fuel. Always use Stabile in fuel. Follow fuel line from fuel tan to carb, ensure no leaks. Remove carb fuel bowl to check float operation. Have pliers to crimp line or use fuel shut off valve. Remove carb float bowl and clean. Float should hang down freely gas should flow. Push float up gas should cut off. Replace spark plug, ensure plug wire snaps on tight. Clean or replace air filter. Ensure oil is full, 30w oil. All mowers have low oil shutoff.
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If you had raw gas in the cylinder to where it poured out of the plug hole you most likely have a carburator problem. Inside the carburator is a float and needle, the float pushes the needle into a seat when the bowl is full of gas so no more gas will flow into the bowl or the engine. If the float won't float or the needle is damaged or has dirt between it and the seat the gas will continue to flow into the carburator and on into the engine. If enough gas gets into the cylinder the starter won't be able to turn the motor over. You should also check your oil, usually when gas gets into the cylinder it runs into the crankcase and thins the oil to where it will damage the motor if run for any length of time.
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The float is stuck on the carb flooding the engine and leaking gas out of air filter. Remove the float bowl after the gas is turned of or drained. Thoroughly clean carb And bowl with carb cleaner. Reove the float {very carefully} if it is copper, shake it. If you here fuel in it then it is no good. If not then clean everything and reassemble. If it needs to be replaced, most small engine repair shops will have your parts.
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Use a spray can lid for the next step under the float bowl area.
BRIEFLY
Open the fuel selector and gently lift the float to level. Fuel must shut off when near level and re-start fuel flow as you lower the float. The spray paint can lid should fill up in 8 seconds or less. If you have poor fuel flow start looking at the bottom of the gas tank or an inline fuel filter as the problem. Some fuel selectors have tiny bowls under the fuel selector lever. Make sure to clean this out also if you have one.

Turn off the fuel selector. Reinstall the float bowl making sure the rubber bowl gasket is fitted properly. Fuel selector ON... leak test. Then test start the unit and see if your symptom is gone.

Thanks for choosing FixYa,
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call dealership and ask to speak to a tech-he can look it up for u --chec fuel delivery from tank to float bowl etc
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