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Yamaha MX & Off-Road Dirt Bikes
Need help reading four stroke plug
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[QUOTE="Rich Rohrich, post: 121789, member: 16241"] I've been telling people for years that plugs (2 and 4 stroke) should be white . The exception is two-strokes will develop a bit of a tan appearance with SOME oils, and some leaded race fuels will color the insulator. The common belief that a plug should be a dark brown is a complete load. Just one more moto-myth passed down through the ages. What I'm saying is you can't read mixture strength by looking at the nose of the insulator. If you don't take a look deep inside at the bottom of the insulator with a magnifier you aren't reading mixture strength, just plug temp. In other words you are wasting your time. Even if you read the fuel ring correctly the only circuit you are reading with all this is the mainjet. You can't accurately read the other carb circuits with the plug. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Need help reading four stroke plug
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