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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Spark Plugs Keep Fouling...
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[QUOTE="rmc_olderthandirt, post: 1416586, member: 68872"] Going from a BR9EG to a BR9EIX would do nothing to prevent fouling, it would only cause you to foul a more expensive plug. Going from a BR9EG to a BR8EG would help prevent the plug from fouling and allow you to work on the jetting issues, which might be your issue. A spark plug has a temperature that it needs to operate at in order to stay "clean" and healthy. If the plug gets too hot it can be damaged. If it doesn't get hot enough then deposits will accumulate on it and it will eventually foul. The numeric portion of the spark plug "number" indicates the "heat range". This basically is a measure of how easily the spark plug can get rid of the heat. The higher the number, the more heat it can transfer out to the cylinder head. If it transfers too much heat out, the plug gets too cold, doesn't burn off the deposits, and fouls. The plug needs to be of a proper heat range, but the jetting needs to be proper as well. It would be unwise to fix the fouling problem by only changing the plug heat, but going to a hotter plug will make life easier for you while you sort out the jetting issues. My suggestion: try a BR8EG plug. If you keep fouling, switch to a BR8ES, they are a lot cheaper. Rod [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Spark Plugs Keep Fouling...
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