Question about 2004 Yamaha YZ 250 F
My bike ran like a champ for 2 years. I have moved and am unable to ride it anymore. I have a guy coming by to look at it. Cant get it to start. Its sat longer than this before, pulled it out and usually started within 10-20 kicks. Ive kicked myself and pushed it up and down hills for an hour. Need help fast.
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Posted on Jan 02, 2017
SOURCE: yz 250 wont kickstart
You obviously look after your machine and very sensible when laying up, however as you are probably aware 2 strokes rely heavily on compression, A. to produce excellent combustion and B. to draw fuel into the chamber. So when you try kick starting you can't get enough revolutions to draw the correct amount of fuel into the cylinder, where as you push start you constantly turn over the engine increasing compression slightly and bingo it fires.
Can you remember how when kick starting it before this problem the feel on resistance when kicking over? has it now become a lot easier? if so you possibly have worn or broken compression piston rings.
A compression test will reveal this, I hope this sorts your query?
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Paul 'W' U.K.
Posted on Feb 06, 2009
Posted on Mar 23, 2009
sounds if you picked up some water/dirt in fuel when was low
clean fuel bowl and flush carb by drain port if still ruff then remove carb for cleaning
Posted on May 19, 2009
you should hav check the valve spec before taking off the head. now you have to reassemble it to check it. see if your over or under adn replace with the appropriate shims.
Posted on Oct 22, 2009
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.
Posted on Nov 01, 2009
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