Question about Yamaha YZ 125 Motorcycles

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REVS HIGH WHEN FIRST CRANK IT, GETS HIGHER WHEN PUSH CHOKE DOWN. RUNS OK AT HALF CHOKE.... TRYING TO SELL IT, RAN FINE HAS JUST BEEN SITTING UP FOR A YEAR. PLEASE HELP!?

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  • Yamaha Master
  • 43,690 Answers

Hi, Anonymous and the usual suspects are:
1. Throttle cables improperly adjusted or pinched.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Dirt Rider Magazine
YZ 125 Climbing high idle Yamaha 2 Stroke
How to Get Your 2 stroke Idle Perfect YZ125
Yamaha YZ125N1 Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 14, 2016

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Posted on Jan 02, 2017

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  • 3567 Answers

SOURCE: bike bogs for second then revs when throttling

Pull the slide out of the carb then remove the jet needle and move the clip one notch lower on the needle.

Posted on Apr 11, 2009

  • 3567 Answers

SOURCE: bike bogs when throttling

Quitting is a no-no. Move the needle clip down one notch and also remove and clean the carb if it has been dieing..

Posted on Apr 11, 2009

  • 226 Answers

SOURCE: 1984 aspencade starts w/choke and revs up, runs smooth. Take off

My 'wing won't run unless it has been warmed up some. I would suggest that you r&r your carbs to make sure the jets in the bottom are working correctly. They tend to get plugged up, especially after sitting & the aluminum flaking off inside... Rick

Posted on Apr 14, 2009

  • 749 Answers

SOURCE: 2003 YZ250 engine coughs and sputters at high RPM

fuel carburetor problem! it causes most of the spluttering problems i have encountered with mine so far!
it could have blockage and insufficient gas enters on it during high revs!

Posted on Jun 18, 2009

SOURCE: 2004 Honda Shadow Aero stalls

There seems to be low gas level in the float chamber of the carburator.
Clean the carburator and check the float level and reset.
With the choke 'on' and if you hit the throttle it will die because there is a restriction of the air flow to the carburator.

Posted on Jul 19, 2009

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