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2000 Yamaha warrior 350 boiling gas


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You can also run a cooler plug. your gap could be to wide or your carb is running to lean. you could also put muffler heat wrap. it keeps the heat off the tank. but if you do that then i would run a cooler plug and reset your mixtures as it will put a bit more heat on the head.

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  • 2 weeks later...

Make sure you aren't running too lean, lean motors run hotter. You may even want to richen up the a/f mix even if you aren't lean just to help it run a bit cooler. Higher octane fuel also helps an engine run cooler. You also may want to consider running an external oil cooler to help keep motor temps down.

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  • 7 years later...

I'm having the exact same problem with my 2004 Yamaha 350 warrior it was running fine I got off of it with it running to talk to someone and then it just started missing and dying then I got it started and started running it pretty hard and it was fine again got back to my house and just let it sit and idle to see if it would do it again and it started smoking a little bit coming out of the exhaust which is something I've never had and smoke was just rising off the front of the 4-wheeler so then it died again and I open my gas cap to check my gas I knew that I had gas but I wanted to look and see if it was leaking and it was boiling like a son of a gun then I took the seat off I saw gas was squirting out of the overspill on the bottom of the carburetor it really freaked me out

 

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Is the head of the engine painted or the entire engine painted ? A lot of people paint the head or engine trapping in heat which causes a overheating problem. 

Check the exhaust that its clear and not packed with sh** causing to much back pressure. 

Lastly is an engine covered in mud or excessive dirt build.   These things add up and cause excessive heat along with a hotter plug and even a high octane fuel cause this condition.  

I would wash the engine down good. If the engine is painted then a pressure wash may be in order.     

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how do you know its boiling?  lol i saw the title for this thread and was like wtf????  i have a yamaha warrior too and never have issues with gas getting too hot...  i had a clutch smoking issue but that was from junk in between the clutch plates..  if gas boils from 2-400 degrees, than your gas tank would be melted before the gas could start boiling.  I would agree that you have a badly vented tank causing a vacuum inside.  if you take apart your gas cap, theres prolly some junk in there. preventing air from entering or exiting the tank when needed..

but seriously- all the youtubers out there need you to come up with their clickbait..  👍:yes:

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  • 2 months later...

If gas is running out of the carb overflow check the needle and seat and especially the o ring at the base of the plug that holds the seat. This is probably the cause of your gas overflow. As to the boiling gas it may be bubbling  but I highly doubt boiling. The tank would have to be very hot. 

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