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2004 LT-Z250 Noises, TAKE A LISTEN!

dag1911

By dag1911
in Suzuki ATV Forum

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dag1911 Apprentice

dag1911

Posted
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Hey guys! I am in need of some serious help with my little quad. Take a listen to the video and see if you can decipher why it is running like it is. I have yet to figure it out.

I have cleaned and rebuilt the carb with OEM parts and jets. Put in a new petcock, fuel filter, and fuel line. Replaced the computer. Put on a new coil, wire, and cap. Replaced the spark plug. Checked the compression and valves. Everything was in spec with the manual. I am at a serious loss. Please let me know your thoughts. :mad:

[ame=http://www.youtube.com/watch?v=3DsTZ23nK6o]2004 Suzuki LT-Z250 - YouTube[/ame]

  • 2 weeks later...
dag1911 Apprentice

dag1911

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Here is another video after I turned the air screw IN a quarter of a turn.

[ame=http://www.youtube.com/watch?v=tXwF10QGcL4]Throttle test 2 - YouTube[/ame]

Tim-ANC Rising Star

Tim-ANC

Posted
Posted

Well I thought you were to keep it fired up. Initially it sounded like a stuck starter to me. Try pulling that out and use the pull start.

Also thinking timing chain jumped. Did you check the timing?

dag1911 Apprentice

dag1911

Posted
  • Author
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Ah yes, I could see that for sure. Nah it starts with just a tiny tap of the starter button. Its always been that way. Plus, this one doesnt have a pull starter.

In the 2nd video I just posted you can hear it idling like a champ right off the bat. When I give it gas is when I encounter the problems. Check it out and let me know what you think.

Tim-ANC Rising Star

Tim-ANC

Posted
Posted

hmmm... you took care of the spark stuff. If the chain jumped it would be hard to start again. Same if your valves are whack.

Thinking fuel starvation or flooding. Do you have a suction fuel pump?

dag1911 Apprentice

dag1911

Posted
  • Author
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The only way the fuel is getting pumped is by mother nature, gravity. There isnt a fuel pump.

But I agree, I think its a fuel issue...perhaps jetting. Not sure cause it ran fine at this elevation prior and it has stock jets in it. So one would think that is a fine base point to start from with minor adjustments thereafter.

dag1911 Apprentice

dag1911

Posted
  • Author
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Yeah there is. New Yamaha style petcock and got rid of the vacuum port on the petcock and blocked off the port on the carburetor. Also on the cap I have a good vent hose coming off of it.

I took the line off the carb and let the fuel run through the petcock, filter, and line and it ran freely. No blockages.

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