Question about Yamaha YZ 125 Motorcycles

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2002 YAMAHA YZ 125 REVS HIGH WHEN CRANK IT

HAS BEEN SITTING UP FOR A YEAR, FRESH GAS BUT WHEN CRANK IT (WITH CHOKE) IT REVS HIGH AND IF PUSH CHOKE DOWN IT REVS EVEN HIGHER. IT WILL IDLE AND RUN OK IF CHOKE IS HELD HALF WAY.

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  • Expert
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One thing I've seen on the initial startup high rev as a problem - make sure you're getting the proper gas flow from the tank. Make sure the petcock or filters inside the tank if applicable aren't clogged. If it's able to start - and for example your air/fuel mixture is set for standard - if you're not getting the proper amount of gas - in essence you're running it hot and fast - because it's running super lean with more air than fuel. It can sometimes run faster - it will definitely run hotter and can lead to even more problems.

Posted on Feb 16, 2015

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Clean the carb out !

Posted on Feb 18, 2014

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Posted on Jan 02, 2017

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SOURCE: Yamaha TTR 125 L won't idle

i cleaned the carb on the bike and put it back together and now it is as if the float is stuck open and is just dumping gas out of the carb all over the ground.

Posted on Sep 02, 2009

  • 15 Answers

SOURCE: Yamaha V-Star 1100 backfires and will not run without choke on

Here are two solutions for you:
A - Take the carberator off and soak it in some good quality carb cleaner for about 1/2 an hour.  That should take care of any residue in the carbs.
B - Alternatively (and for the less technical minded) there is a great product called Sea Foam.  Try to find it at your local CSK auto/NAPA/Wal-Mart.  Pour a small amount (maybe 1/4 ounce) into each cylinder chamber (take out the spark plugs), try to pour a small amount into the carbs (a turkey baster works great for this), and pour the rest into the gas tank.  Let it sit for 5-10 minutes, then start it up.  *NOTE - the bike will start VERY hard at first until it burns through what's in the cylinders.  ALSO the fumes will be EXTREMELY strong and suffocating - make sure you do this OUTDOORS preferably, or at least in a VERY well ventilated area.
Good luck - I know how frustrating these things can be! :)
P.S. - I am a proud owner of a V-Star 1300 - great bikes! :)

Posted on May 26, 2009

  • 3567 Answers

SOURCE: how do i decode yamaha yz 125 engin id number

You don't decode it. It is only a production run series number. Mororcycles are like cars in that respect. It is the frame number, AKA the "VIN number", is what carries all the information. Call a dealer with the frame number and he can tell you year, paint color, specific model and more. They may have a problem if the bike is too old. Yamaha changed to a newer code system a few years back.
Can I get a “very helpful” rating on this answer?

Posted on Aug 28, 2009

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1 Answer

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!?


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

Feb 17, 2014 | Yamaha YZ 125 Motorcycles

1 Answer

Motorbike stuck on high revs


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
Bike runs wide open after closing throttle
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Dec 27, 2013 | 2003 Yamaha YZ 125

1 Answer

Bike revs uncotrollaby. 125 yz 2002


Is the throtle cable stuck? if not look at a good carb clean, it could have enough gas to start but be too lean that would make it rev up. Two stokes also do this right before they run out of gas

Jun 08, 2011 | 2003 Yamaha YZ 125

1 Answer

My yamaha yz 125 01 wont start no mather how much you push it or kick it. Fauling pulgs, Back firing, and Taking water...


may have bad fuel.... has bike or fuel been sitting for a long time. drain tank and the carb bowls. try New Fresh fuel ... What do you mean by taking water??

May 15, 2011 | 2003 Yamaha YZ 125

1 Answer

New top end- now does not idle-bogs out when given gas


Sounds like an issue with the choke not opening.

Nov 25, 2009 | 2003 Yamaha YZ 125

1 Answer

Bike wont idle or start


try turning the idle up and when you do it give it a little bit of gas

Aug 16, 2009 | 2003 Yamaha YZ 250 F

2 Answers

2000 YZ 125 Breaks up at High RPM. We think its the power valve. any tips would be great


check fuel float level as it might not be able to keep up the flow rate at those revs
or the read valve has become weak

Jul 19, 2009 | 2003 Yamaha YZ 125

1 Answer

Yz 125 99 won't run


You need to ensure for the Carburettor Needle fixed, so that the fuel injected out properly, also if the Crank Gasket should be fitted properly.

Jun 17, 2009 | 2003 Yamaha YZ 125

1 Answer

250yz revs high on idle or when clutch not engaged


Sounds like it is time to take the carb apart and clean or replace what needs replacing/cleaning.

May 31, 2009 | 2004 Yamaha YZ 250 F

2 Answers

2001YZ426F oil blowing out vent tube


Dear pmg1, Sat 02-21-2009 5:37pm EST (USA)

RE: 2002 Yamaha YZ 426 F
or
2001 YZ426F

"Hard to Start if any and/or Oil Blowing Out Vent Tube"

RE: ABOVE is what I'm reading @ the fixya Site @
http://www.fixya.com/PostAnswer.aspx?thid=1695323&prdid=986097&ctgid=391 so.......

Is your Yamaha a 2000 or 2001?
Did You try to start it several times, then it kicked in a little, then a little more, then
started spitting oil and won't even start?
Has it been sitting for quite some time?
Did you put new gas in it?
If so...................................................
Check the OIL and replace if needed..........................................
Put in a can of high test GAS...Spend at least $10.00!.................
Spray a lot of Starter Fluid ($3) into the Air Intake........................
Crank Engine!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !

When you get it running, IF IT'S STILL BLOWING OIL .............................
Add a can of CRANKCASE SEAL'S LEAKS (less than $10) for conditioning
the seals............................................and......................................................

NEVER USE YEAR OLD GAS AGAIN AND ADD FUEL CLEANER AT
EVERY OIL CHANGE!

jack
b806e68.jpg

Feb 21, 2009 | 2002 Yamaha YZ 426 F

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