Question about 2003 Yamaha YZ 125

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Sparks from my exhaust ??? Yamaha yz 125

I took my bike out the other day and for about half an hour and it was fine then soon after i reved it up to pull away and a load of sparks came out the exhaust pipe ???

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If it still runs ok ,it was probably rust or debri from the muffler,if it dosent run ,or preformance changed after the sparks,internal engine damage would be a likely cause,part of a piston ring or something like that

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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1 Answer

MY 1998 YZ 125 KEEPS FOULING PLUG AND THEN BOGS DOWN


Hi, Anonymous and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Incorrect spark plugs for your kind of service.
3. Piston rings badly worn or broken.
4. Valve guides are badly worn and/or seals worn, crushed or have come off valve guide and pump oil through it.
5. Spark plug cable weak or ignition coil faulty.
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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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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Hi, Anonymous 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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Mar 07, 2013 | 2003 Yamaha YZ 125

1 Answer

I have a 2006 Yz 125 Is the push rod assembly suppose to have free play?


Hi, Cameron your bike is a 2 stroke it does not have push rods for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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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Feb 20, 2013 | Yamaha YZ 125 Motorcycles

1 Answer

Alrite ? Iv got a yz 125 2001 it's had new piston


Hi, Dean for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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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May 11, 2012 | 2003 Yamaha YZ 125

1 Answer

2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied


Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
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.
2002 yz250 idles fine but bogs and tries to die when twisting the throttle...
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YAMAHA YZ250 LC Owner Service Manual
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Mar 19, 2012 | 2003 Yamaha YZ 250

1 Answer

I have a 1993 yz 125 took off acrossed a field went through all the gears 2 times then all of a sudden i lost the power band competely?


Hi, Kstatzer and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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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Mar 22, 2011 | Yamaha YZ 125 Motorcycles

1 Answer

Yz 125 wont start


gunk in carb jets pluged

Jun 18, 2010 | 2003 Yamaha YZ 125

1 Answer

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

Jun 03, 2010 | 2003 Yamaha YZ 125

2 Answers

How to modify yamaha RX100 in yamaha YZ 125


it is possible in a city like bangalore

Apr 02, 2010 | 2003 Yamaha YZ 125

1 Answer

Hello, I have a YZ 80 and i was wondering why my


Look at ?

crank seal (drawing air)

ring wear

main jet (blocked jet's)

fuel starved carb

Jul 15, 2009 | 2003 Yamaha YZ 125

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