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Old 06-23-2010, 04:57 PM   #2
Not Yet Wild
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Join Date: Apr 2010
Location: Bothell Washington About 20 miles north of Seattle
Posts: 68
Default Re: 92 Yamaha fouling plugs

According to the G8 & 9 use NGK-BR4ES for 91 and newer and NGK-B5ES 90 and earlier. The R in BR4ES stands for resistor type plug. The 4 is the heat range spec. 5 being a cooler plug and a 2 is about the hottest plug you can get. I don't recommend going to a 2 for that cart.

As for the fouling... Is there evidence of oil on the plug? If so it's probably rings if not then its possible that the igniter coil is going bad.
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