2003 Yamaha YZ 125 Logo

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jon dimo Posted on Nov 03, 2013
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Just done yz125 top and bottom end rebuild has gas and spark but wont start

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Russ Hill

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  • Yamaha Master 4,057 Answers
  • Posted on Nov 03, 2013
 Russ Hill
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Check the timing marks are in line.

5 Related Answers

Anonymous

  • 2 Answers
  • Posted on Apr 03, 2009

SOURCE: no problem just done top end rebuild

turn the tick over screw on the carb not to much and make sure the back wheel is off the floor and start the bike and let it tick over in forth gear for a while

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Anonymous

  • 490 Answers
  • Posted on Apr 15, 2009

SOURCE: kicking oil out exhaust

repack the silencer and what are you mixing ratios for fuel??

mxtras

mxtras

  • 194 Answers
  • Posted on May 04, 2010

SOURCE: yz125 rear shock amount of oil on

The volume is less than about 1/2 quart - it's usually not measured going in since you fill the shock completely - there's no need to measure. Some guys assemble the entire shock, then fill with oil and cycle the shaft, then install the bladder cap last. My method is to install the shaft and seal head and the bladder, then put about 2 PSI in the bladder, then bleed through the compression cap. My method is a bit more complicated to explain, but it's effective at eliminating ALL the air from the oil and it keeps the bladder from being installed in a collapsed state.

As far as the nitrogen charge - 145PSI is stock. 130-160PSI is typical.

Anonymous

  • 5 Answers
  • Posted on Jun 03, 2010

SOURCE: yz 125 2001. starting ploblem after top end rebuild

Kinda sounds like your needle valve is sticking in your carb and it is giving it to much fuel

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gavin jones

  • 1508 Answers
  • Posted on Aug 25, 2011

SOURCE: i am working on my

looking from the left side, the crank spins counter clockwise.
I'm intrigued how you would turn it backwards, if you touch the starter or kick start, it is going to go the correct way. If the tensioner is working it shouldnt slip anyway

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check your gas mixture you might have the mixture to much oil in gas drain the gas and make a new mixture up according to saw Manuel or pull spark plug out and pull a few times make sure spark plug is gap right put back in and try it if it happens again pull out spark plug and see if it is wet with fuel if it is the the carburetor need to be ajusted
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YZ125 won't start

yeah something you wanna check next, compression. if you can get your hands on a compression tester.
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