Question about 2003 Yamaha YZ 125

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2002 Yamaha YZ 125 will not start

2002 yz 125 push rod for the clutch is coming out. when I go to kick it, it jams up, but not seized up. pulled the spark plug, its flooded with gas and won't fire. Put it in gear and the bike tire will turn, but kicking it, it still won't start. can ya help @

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  • Yamaha Master
  • 58,590 Answers

Hi, Dave and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Quick disconnect check ball stuck.
14. Compression below 75 PSI.
15. A stuck-bent-burnt valve.
16. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
17. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
18. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
19. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
20. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
21. Faulty neutral, clutch, kickstand safety switch.
22. Faulty fuel pump or fuse or relay.
23. A stuck bent or burnt valve.
24. Tilt sensor needs a reset.
25. Security system not disarming alarm needs a reset.
26. Check for engine trouble codes.
27. Faulty run stop switch.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
yz 125 wont start
YZ 125 wont start
YAMAHA YZ125 LC Owner Service Manual
https://www.partsfish.com/page/oem-parts-for-yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on Dec 03, 2017

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6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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FoRdMaStEr
  • 53 Answers

SOURCE: 1997 yz 125 wont start, please help

2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.

Posted on Jan 13, 2009

  • 1 Answer

SOURCE: on my yz 125 my kick start is jammed

Were you riding it when it jammed because that could mean the that something is sized inside the motor, like the crank or the pistion

Posted on Mar 30, 2010

  • 164 Answers

SOURCE: kick jams,put into gear and pull bike backwards

two things come to mind firstly isthe machine correctly in neautral or have you picked up a flse neautral between gears if it is in fact properly in neautral tnhen I would be checking both the kickstart return spring & your selector mechanism

Posted on Apr 03, 2010

  • 5 Answers

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

Posted on Jun 03, 2010

mxtras
  • 194 Answers

SOURCE: 2004 yamaha yz 125,All stock,wont

I agree with Rotax81 - it sounds like you're down on compression. Low compression will make a 2-stroke run rich and will make any engine increasingly difficult to start. What you describe sounds like the classic tell-tale signs of a shot top end, plain and simple.

I would not mess with the carb until you confirm the condition of the top end - it would be like putting a Band-aid on a broken Femur.

Scott

Posted on Mar 31, 2011

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If the clutch drags you need to check the plates and the worse thing to do when a bike wont crank is to pop start it you just do more damage and defiantly only use the right oil

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Hi, Moto582 for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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.
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Jul 10, 2012 | 2005 Yamaha yZ 125

2 Answers

On my yz 125 my kick start is jammed


Were you riding it when it jammed because that could mean the that something is sized inside the motor, like the crank or the pistion

Mar 27, 2010 | 2003 Yamaha YZ 125

1 Answer

I have a 1990 yz 125 my clutch wont grab at all


did you torque the spring up when you put them in and did you put the push rod in the middle |???

Oct 08, 2009 | 2003 Yamaha YZ 125

1 Answer

2006 yz 125 breaking push rod in clutch


That is a bit strange. Did the previous owner install stronger springs than the stock ones? Compare the effort to pull your clutch handle to what it takes on a new 125. Be sure you have clean 10w40 motor oil in the gearbox. No synthetics or special additives. Replace the rod and the lever assembly. The rod, lever and oil should eliminate the problem assuming the springs are stock.

Can I get a “very helpful” rating on this answer?
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Aug 31, 2009 | 2004 Yamaha YZ 250 F

1 Answer

Yamaha YZ125 Clutch not disengaging


I would be more concerned with the stuck gear than the clutch, but we will start with the clutch.

02ccdb2.gif The push cam may be bent or deformed and the push shaft may be bent. Assuming the ball bearing is in place, the cam and rod are all that can really go wrong. The rod slides out of the left center case. You will need to loosen the springs to get the left side cover back in place. Roll the rod on a flat surface to see if it is bent. I fear a bent shift fork is causing the gearbox to be stuck in third. Fix the clutch and then post a comment to get back to me.

Jul 26, 2009 | 2003 Yamaha YZ 125

1 Answer

Yz 125 2001 stays in gear with clutch pulled in


hi m8,,this might sound stupid,, but in winter dayz and salty conditions ,cables corrode in side,,so i can start some where to help,, 1st take the cable off the handle bar,, and the clutch casin,,get a little bit of oil in a jam jar or any thing like that,,dip one end of the cable in the oil ,and keep pullin and pushing the inner cable as if u were trying to draw oil up threw the inside of the cable ,, turn cable the other end and repeat,, try that 1st m8,, still have probs come bk, and il go threw the next step,,

Apr 19, 2009 | 2003 Yamaha YZ 125

3 Answers

Help!


could be a few different things...a seized top end...the kickstarter gear is damaged... the transmission(not clutch) is damaged

Apr 05, 2009 | 2004 Yamaha YZ 125

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