SOURCE: YZ250F kick starter is backing out of gearbox
Go to the site below and download a free factory service manual.
http://www.carlsalter.com/motorcycle-manuals.asp
Kick starter starts at page 175. I am certain this will help.
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SOURCE: i have a 2004 yamaha yz250f it will only start with starter fluid
check the carburator if there is a gas goes to it
SOURCE: My Yamaha yz250F 07 starts first kick but back
I see: you changed the plug because it was backfiring.
Does it back fire when you let OFF the throttle after revving it, or does it back fire while being revved?
If it does it when you let off then Ollie's suggeston might do it. If that doesn't do it then check for dirt in your pilot jet.
If it back fires when revved up high could be dirt in your main jet.
SOURCE: Not sure where to check oil in my 2004 Yamaha
Look on the left side of the frame up near the steering stem, above the radiator - you will see a black knob looking thing. That's the dipstick.
SOURCE: 2004 yamaha yz 125,All stock,wont
I agree with Rotax81 - it sounds like you're down on compression. Low compression will make a 2-stroke run rich and will make any engine increasingly difficult to start. What you describe sounds like the classic tell-tale signs of a shot top end, plain and simple.
I would not mess with the carb until you confirm the condition of the top end - it would be like putting a Band-aid on a broken Femur.
Scott
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