Question about 2004 Yamaha YZ 250 F

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08 yz250f wont start after sitting up

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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  • Expert
  • 55 Answers

Turn gas on under tank ,get new spark plug, gas mite be bad.

Posted on Feb 15, 2014

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6ya6ya
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Posted on Jan 02, 2017

onyeredson
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SOURCE: yz 250 wont kickstart

Hi!
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?
Press the Blue button please for my FREE effort,
Thank You!
Paul 'W' U.K.

Posted on Feb 06, 2009

  • 3567 Answers

SOURCE: while riding my yz 125 it just died and won,t kick up again

  • If a hole in the piston then install new piston and rings. Next, clean the carbon off the head and install a new head gasket.
  • If cylinder wall is scared the piston has seized up. Pull the cylinder off and take it to the dealer. Have them bore the cylinder and return it along with a new oversize piston and rings.
  • While at the parts counter, get a new stock spark plug and a supply of Yamalube Two Stroke Motor Oil. You need to add 4 ounces per gallon when filling up. This will be a 32/1 gas to oil ratio. NEVER ride the bike without at least the needed 32/1 mix.
Please rate the solution as a "FixYa" if able. Thanks!

Posted on Mar 23, 2009

  • 190 Answers

SOURCE: my 01 yz 125 wont start with kick start,n loses power in low rpms

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

  • 197 Answers

SOURCE: how do i re-shim my 07 yamaha yz250f?

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

  • 1 Answer

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.

Posted on Nov 01, 2009

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