Question about 2004 Yamaha YZ 125

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What is the correct spark plug for a 2005 yz125?

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Hope this information helps these are Denso Plugs
YAMAHA
YZ125 what is the correct spark plug for a 2005 yz125? - green.gif
YEAR 2004-1999 ENGINE 125 cc APPLICATION INFORMATION STANDARD STK# 4049 STANDARD PLUG# W27ESR-V IRIDIUM POWER STK# 5317 IRIDIUM POWER PLUG# IW27 IRIDIUM RACING STK# 5714 IRIDIUM RACING PLUG# IW01-27 GAP 0.024

Posted on Apr 11, 2011

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1 Answer

Whats the best racing spark plug for a yz125


Hi, Anonymous 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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Yz125 2005 not get fire


Its quite a brief description of issue but any way I assume it is not starting???

You need 3 things to have a running motor 1 Spark at plug test this by removing plug connecting it back to the plug lead lay it on motor and kick bike over to see or not the spark, 2 fuel getting through to spark plug... test this by smelling and feeling the spark plug immediately after kicking it over should be wet and strong fuel smelling... 3 compression there are special tools for this but a simple back yard test is remove spark plug put your finger or thumb over the hole the plug came out of and gently kick bike over if your finger is not forced off instantly and you can resist some or most of the pressure when kicking it over then you have nowhere near enough compression...

This at least will give you diagnosis to know what to investigate further to get the beast to fire... Good luck

cheers... Motoxpartsonline.com

Dec 19, 2012 | Motorcycles

1 Answer

Yz 125 1991 no spark


Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
6. Faulty ignition coil or electronic control module or CDI box.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
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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Sep 18, 2012 | Yamaha YZ 125 Motorcycles

1 Answer

NO SPARK 1995 YAMAHA YZ125


Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
6. Faulty ignition coil or electronic control module or CDI box.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
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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YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Sep 12, 2012 | 2003 Yamaha YZ 125

1 Answer

What is the spark plug gap for 03 yz 125


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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YAMAHA YZ125 Owner Service Manual
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Apr 26, 2012 | 2003 Yamaha YZ 125

1 Answer

What size spark plug is the correct size for a 2003 yz125


Hi,
The right spark plug is NGK BR9EG
Alex
PS-Don't forget to vote me, thank you!

Dec 17, 2010 | 2003 Yamaha YZ 125

1 Answer

My yz125 runs like it is always cold, why?


It's likely just jetted too rich. If you pull your spark plug, it will likely be black and oily. To correct this, you need to alter your jetting. Jetting is not an art - it's fairly straightforward - you just have to physically change the jets inside the carb.

Apr 11, 2010 | 2003 Yamaha YZ 125

1 Answer

Yz125 spark plug problem


What does removed plug look like??

Is the plug correct for this bike, very important.

Jan 03, 2010 | 2003 Yamaha YZ 125

1 Answer

No spark on my 2000 model yz125 pleas help


it could be any one of these things.... the pick up from your rotor/flywheel could be crapped up or not close enough to your rotor/flywheel....cdi unit could be faulty....coil,ht-lead or plug cap could be faulty....could be a short in your wireing or chicken switch(cut off)

Sep 17, 2009 | 2004 Yamaha TT-R 225

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