04 YZ450F starting issue?

2 replies to this topic
  • mxpro2698

Posted April 07, 2011 - 01:50 PM


I bought an 04 yz450f from a friend. It had been sitting for a while so i did a complete service on it (oil, filters, plug, ect.)I also completly cleaned out the carb and jetsand removed old fuel. Took it out and it ran and started great all day. Went to go ride the next day and now it won't start. If i put the choke on and pump the gas a few times it will start for a second and then die. I assumed this was from the acelerator pump injecting the small amount of fuel. If i spray a little bit of starting fluid in it it will run for a few moments and then die. Sounds like a fuel issue so i took apart the carb and cleaned everything again. Still have the same results? The compression seams to be good and all. I am used to 2 strokes so this has me just confused now!!!!

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  • jasen 2007

Posted April 07, 2011 - 02:32 PM


Did you happen to remove the fuel screw? If so did you make sure the spring, washer and O ring were put back correctly?

  • mxpro2698

Posted April 07, 2011 - 03:39 PM


the one in the bottom front of the carb?, if so yes, it has an after market one but i cleaned it checked the o-ring and put it back in to about 2 turns out.and yes the spring is still there

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