Question about 2003 Yamaha YZ 125

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Spark plugs ar carboning


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Is it burning to much oil??? is the carb in tune?
you could try a hotter plug,,this should stop it guming up on you

Posted on Jun 03, 2010

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Check battery voltage, remove spark plug suppressor cap from HT lead and see if spark is good by holding lead in a gloved hand and placing the lead end near the engine. If spark good get a new suppressor cap. Check the plug shows a good spark in the new cap by holding the screw thread to the engine. Poor spark change spark plug. If you get a poor spark from the HT lead then get the ignition coil checked.

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some plug leads have carbon inside the lead and occasionally they break down .Replacing the lead and or the cap should fix the problem BOB

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Hi, Dobysclann and the usual suspects are:
1. Fouled spark plugs.
2. 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 preliminary 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.
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4. Loose connection at ignition coil or plug between ignition sensor and module.
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6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
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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.
How to diagnose no spark situation on motorcycle
Yamaha XVS1100 Service Manual
OEM parts for Yamaha
YAMAHA XVS1100 Owner Manual

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1 Answer

I have a 1980's yamaha golf cart and it keeps idling when turned off sometime it turs off is it the soleoid

If you are saying that the motor keeps on running after the key is turned off, one of three possibilities exist. The key switch ihas gone bad, check it with an Olmmeter. Someone has messed with the wire connections, check out all wiring for proper color coded connections. The engine is deiseling because of carbon buildup on the piston and cylinder head. This is the most likely reason for the continued running. The carbon buildup will create hotspots that are hot enough to ignite the fuel even without the spark plug. Pull the head and scrape the carbon off using a screwdriver and a wire brush. Also, clean away any dirt, leaves, grass clippings or whatever may be blocking air from cooling the engine. The starter solinoid can go bad but you surely know the sound of the starter motor verses the sound of the engine.

Aug 19, 2010 | 1981 Yamaha XJ 650

1 Answer

My motorcycle won't fire.

Check you have power to the plugs take out both plugs and place one on the cylinder head and see if you get a spark .Try rubbing a pencil lead on the contacts ,as this give a highter spark .If no spark on either plugs you have an electrical fault which could be any number of things ,Try W/D 40 on the ignition switch it my be corroded inside and not making contact .or check your wiring for breaks or corroded terminals.or connectors .

Mar 12, 2010 | 1981 Yamaha XS 400 Special

1 Answer

81 yamaha xj 650 spark plugs fire when engine isn't running

If you are saying the bike still continues to want to run, (rough running I am sure ), after the key is shut off then the engine is "dieseling". Carbon buildup on the piston / valves/ cylinder head is getting red hot from running. The hot spot(s) serve to ignite the fuel much the same as the spark plugs would. Burn only premium gas, be sure the cylinder is clean and not caked with mud or such, and change to a colder spark plug like NGK BP-8es or BP-9es ( BP-7es is the stock plug ). This may keep the engine cooler and stop the problem. The only other way is to pull the head then de-carbon it and the pistons. While the head is off, re-seat the valves using valve grinding compound. Check out Babbitts for parts. Go to Please rate my answer.

Feb 24, 2010 | 1981 Yamaha XJ 650

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Lift the back of the tank up and prop it up. Remove the chrome beauty covers, find spark plug wires and remove. Blow out with air first. Chaz Moto DC

Jan 15, 2010 | 2001 Yamaha V Star 1100 Classic

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Sep 26, 2009 | 1981 Yamaha XS 400

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Spark Plug wires

should be 1342 try it!

Good luck .

Knight (yamaha XJ750 R 1981)

Apr 17, 2009 | 2000 kawasaki ZRX 1100

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