Question about Yamaha YZ 125 Motorcycles

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Old yz 80 about a 90 no spark

Old yamaha yz 80 about a 1990 no spark clean mag new plug

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  • A Miller May 11, 2010

    wire from mag to coil is good (you tested it, right?)

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  • Master
  • 1,167 Answers

Check to see if you have power to the coil with a volt metre bud

Posted on Oct 05, 2009

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1 Answer

2005 yz250 2 stroke has no spark! changed out spark plug, stater, coil, plug cap, cdi, checked wire harness for continuity? cleaned ground block and still no spark? what did i miss?


Hi, Rob1 and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, needs to be 12.5 volts or better and be able to pass a "LOAD" test, your battery may show 12.5 volts but has little or zero amps and must be replaced.
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 check for spark leakage in the dark.
6. Faulty ignition coil or CDI or electronic control module.
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 blue links below. Good luck and have a wonderful day.
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Yamaha YZ250 Project Part 1 No Spark
YAMAHA YZ250 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

May 01, 2017 | 2005 Yamaha yZ 250 F

1 Answer

What is there down the hole midway stopping me from access to the spark plug on my 2004 yz250, feels like a liner of some sort, the spark plug tool will not go further or I would have to use major force to...


Hi, Anonymous you may have an old spark plug boot that was torn in half by a previous owner or it could be the rubber liner of a deep well socket that was designed especially for spark plugs for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YZ250F Spark Plug Removal Replacement Applies to MOST 4 Stroke MX Bikes...
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2001 2013 Yamaha YZ 250 Service Manual YZ250 Moto Data Project
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jun 24, 2014 | 2004 Yamaha YZ 250

1 Answer

What is the spark plug size for yz 250


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.
YAMAHA YZ250 NGK Standard Series Spark Plugs 14mm Spark Plug Thread Size...
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Jun 06, 2014 | 2003 Yamaha YZ 250

1 Answer

Yamaha yz 250 specs


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.
Spark Plug for YZ250 Yamaha 2 Stroke
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

May 15, 2014 | 2003 Yamaha YZ 250

1 Answer

Changing the spark plug on 2002 yz250f


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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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 27, 2014 | Yamaha YZ 250 F Motorcycles

1 Answer

I have a yz 250 Yamaha layed it over on it side and now can't get it to start put new spark plug in has spark but won't fire


fuel problem take out the carb and clean all the jets and the bowl also put a high flow fuel filter in as a precaution incase there is debree in the tank your problem is that you are not getting enough fuel or any at all.

May 11, 2012 | 2003 Yamaha YZ 250

1 Answer

My yamaha pw 80 won't kickstart and can you tell me why gas is coming out were the spark plug goes when i try kickstart?


I'm assuming you mean gas comes out the spark plug hole with the plug removed??? You probably have a gummed up carburator, due to old gas or dirt. Make sure your air filter is clean first, and then get your carburator thoroughly cleaned. If your float is sticking, or the float needle is dirty or worn out, it will keep dumping fuel to the engine.

Mar 31, 2011 | 2003 Yamaha YZ 125

2 Answers

My yamaha yz 125


if your getting spark than i would take the carb off and clean it you could have a cloged jet.( just because your getting fuel from tank to carb dont mean its getting from carb to jug) i would try that first......yz-maniac.

May 14, 2010 | 2004 Yamaha YZ 125

1 Answer

My yzf 450 sat a few months in garage I cleaned


Hi,
The spark plug has shorted.. Just get a new spark plug and all will be well.
Also get new fuel.
Regards
Berry.

Jan 31, 2010 | 2004 Yamaha YZ 450 F

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

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