Question about 1996 Yamaha SZR 660

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Spark plug fouling when cold starting

Spark looks weak at cranking speed, fitted new iridium spark plug this seems to have improved starting, if I clean spark plug and refit it will start ok.

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  • gpmoto May 11, 2010

    is battery fully charged and hold up to a load test? if so is starter turning as fast as it should to turn flywheel fast enough past stator to produce enough primary voltage in ign. coil?

  • joe May 11, 2010

    are you using the correct heat range spark plug for this bike?

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  • 132 Answers

Sounds like the carb wants cleaning and re-balancing

Posted on Jun 19, 2009

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Spark plugs foul immediately


Fouled plugs may be caused by oil leaking into the cylinder. Does it smoke when running (cold), are you using up the crank oil. Black smoke is excess gas comsumption, blue smoke is oil burning. If your plug is fouled with black carbon, you are most likely running to rich.

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Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.

When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.

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I want to replace the standard spark plug of my 1995 2.0 Honda Accord to Iridium Spark Plug. What is the specs of the Iridium Spark Plug will I buy? Does this help in improving the engine performance? in...


I've never found there to be any performance differences for the Accord using copper core plugs versus iridium. The iridium plugs cost substantially more, but last longer. They are more reliable.

However, if you are looking for such things as better performance, then the best potential rests on the copper core type. If you've modified the car such as added a turbo or supercharger, copper plugs are best. The reason for that is that copper core plugs have a lower heat range than iridium. Heat range is in reference to how quickly the electrode cools after the spark has fired. Copper dissipates heat faster than iridium. In your cylinder you want the only fuel ignition source to be the spark and never anything else...such as the end of a spark plug that is still hot enough to ignite your fuel without the spark plug firing. A copper plug is least likely to do this.

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1 Answer

Weak ignition spark


Make sure battery is up at least 11 - 11.5 volts
A low battery will spin over and sound like it should when cranking sometimes, but the starter will rob spark from the ignition and not fire due to low voltage

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P0300 Engine Code Ford ZX2 2002 ZTEC dual over head cam engine. Has 107K miles. Has new plugs, Only thing I really notice is when I turn on AC the car seems to stumble at steady speeds, especially...


P0300 Random Misfire

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

A Random Misfire code usually indicates a vacuum leak or bad gas.

NOTE: If a misfire in a specific cylinder should lead you to check the spark plug, fuel injector and compression.

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Fouling occurs when the spark plugs' firing tip becomes coated with excessive fuel, oil, or combustion deposits so that it is unable to produce a spark. A plug can become fouled from continuous low speed driving, improper spark plug heat range (too cold), improper timing (over-retarded), too rich an air/fuel ratio or an oil leak into the combustion chamber. A variety of self-cleaning features are designed into most plugs to reduce fouling.

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91 kx 250 blows smoke and drips alot of unburnt oil out the pipe


Does it have a stock pipe,carb,any modifications! If its stock,I would put a new ring and piston in it,it seems like your getting a lot of blowby,also make sure your air filter is clean. It would help if you used an iridium spark plug.

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The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

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1 Answer

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Auto or manual choke? Could be out of adjustment. Cold engine idle speed may be too low. Fouled sparkplugs may be producing a weak spark (always buy high quality plugs). Maybe a weak coil. Make sure it's covered at night. Do they sell electric dipsticks for MC's? Hope you find the problem. Good Luck.

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1 Answer

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you could have fuel fouled plugs..... once that way there is no way to fix them just replace them.... and it will not start with fouled plugs......... then check the timing belt for cam to crank timing

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